Switch to next node when ApiNotSupported and node returns Client returned invalid format. Expected JSON!
* enforce utf-8 on node reply parser

* set num_retries to a default of 100, in order to prevent crashing when a wrong node is set

* pep8 formating improved
* Too Many Requests error handled
* different limit handling in WLS fixed for account history
* percent-steem-dollars and max-accepted-payout added to beempy post

Account
* some code improvements
Graphenerpc
* small improvement in chain detection
Steem
* replace_steemit_by_steem option removed from get_config
* witness_update fixed
Comment
* Fix docu
chain
* Waleshares added
Unit test
* unit tests fixed

disable_chain_detection added to graphenerpc (for testing hivemind e.g.)

Relase nodes for 0.19.45 added

Blockchain
* thread_limit parameter removed
* batch_mode set to True for threaded blocks()
* block sanity check added for threaded blocks()

Account
* lazy and full are correctly passed
* _parse_json_data() added to parse json
Block
* lazy and full are correctly passed
* empty operations are handled
* op_statistics improved
Blockchain
* virtual ops and ops statistics are seperatly calculated
Comment
* _parse_json_data() added to parse dates and amounts
* author_reputation is parsed to int
* lazy and full are correctly passed
Vote
* lazy and full are correctly passed
* _parse_json_data added to parse date and rshares and reputation
* vote.time is a datetime object
* json() returns the original string
Witness
* lazy and full are correctly passed
GrapheneRPC
* time_limit removed, as it supresses KeyboardInterrupt
* ws.settimeout() is set for websocket
* WebSocketTimeoutException  handling added
Unit tests
* test_account fixed
* test_time_limit removed from test_steemnoderpc
* checks added to test_blockchain_batch

Comment
* Add example
Steem
* improve docu
Exception
* Add TimeoutException
GrapheneRPC
* add time_limit to implement a timeout for websocket connection
Unit test
* add test for timeout implementation

Market
* _weighted_average, btc_usd_ticker, steem_btc_ticker and steem_usd_implied added
Witness
* get_votes_sum added to witnesses object
Graphenerpc
* fix handling of WebSocketConnectionClosedException
CLI
* witnessfeed: uses the new market ticker to calculate the current steem_usd price as base. When using support-peg the sbd_usd price is calculated from the internal ticker and used for quote.
* Witness: shows the rank and active rank (when it is below 250). virtual_time_to_block_num is calculated from num_scheduled_witnesses, VIRTUAL_SCHEDULE_LAP_LENGTH2 and vote_sum. This is then used to estimate the next block producing time.
* witnesses uses a proxy now, when set.

CLI
* updatenodes added, this command can be used to update the nodes list
NodeList
* update_nodes added, this command reads the metadata from fullnodeupdate, which contain newest nodes information
* add option wss and https fo get_nodes
Unit tests
* use updatenodes in all tests

Wallet
* getKeysForAccount added
* getOwnerKeysForAccount, getActiveKeysForAccount, getPostingKeysForAccount added
beemapi
* WorkingNodeMissing is raised when no working node could be found
GrapheneRPC
* cycle([urls]) is replaced by the nodes class
Nodes
* Node handling and management of url and error_counts is performed by the nodes class
* sleep_and_check_retries is moved to the nodes class
* Websocket, steemnodrpc were adpapted to the changes
Unit tests
* new tests for the nodes class
* tests adapted for websocket and rpcutils

Set use_condenser to True
Add unit test for hash_op

Certain transaction could not be verified, as the recover parameter in verify_message from ecdasig was wrong.
Signed_Transaction.verify() iterates now always through all 4 cases and returns all found key combination.

Unit test added for this case.

Account
* print_info improved (Last Vote added)
* entryId changed to start_entry_id in get_feed, get_blog_entries and get_blog
*rpc.get_account_history moved to _get_account_history
* estimate_account_op added, can be used to fastly get account op numbers from dates or block nums
* history and history_reverse uses estimate_account_op
Exception
* KeyNotFound removed
Memo
* raises MissingKeyError instead of KeyNotFound
Price
* small improvement
Steem
* __repr__ added
Transactionbuilder
* get_potential_signatures, get_transaction_hex and get_required_signatures added
* raises MissingKeyError instead of KeyNotFound
VotesObject
* __contains__, __str__ and __repr__ added
Wallet
* raises MissingKeyError instead of KeyNotFound
Witness
* __contains__, __str__ and __repr__ added to WitnessObject
Steemnoderpc
* small improvements
Operationsid
* producer_reward added
Unit tests
* new function added and tests adapted to changes

Blockchainobject
* auto_clean function added. Everytime a new item is stored into the cache, all expired elements are removed.
* The __contains__ function sets now data ot None, when the date is expired, in order to reduce memory consumption
CLI
* threading for pingnode added. with --threading, all nodes are tested simultanously.
Steemnoderpc
* Error count and exception improved when only one node is available
Graphenerpc
* regests.session is stored as signelton
* requests_retry_session removed
* shared_session_instance and set_session_instance is used to get and set the global request.session object
* create_ws_instance added; A websocket is created everytime and the singleton is removed
* error_cnt and num_retries_call handling improved
RpcUtils
* sleep_and_check_retries improved
Examples
* benchmark_node2 uses threads (one thread for each node)
* memory_profiler2 added to check memory consumption for creating multiple account objects
Unit tests
* test for objectcache improved

Unit tests fixed

Account
* Examples and Dokumentation improved
Amount
* Example improved
Asciichart
* Examples improved
Blockchain
* examples improved
Discussions
* Doku improved
Market
* Examples and Doku improved
Price
* Examples improved
* Missing steem_instance fixed
Steem
* Example code fixed
Graphenerpc
* Example improved

Account
* Example forget SimilarAccountNames  added
* Example for history and history_reverse improved
Amount
* Example is tested with doctest
Block
* Example is tested with doctest
Price
* Fix example
Profile
* Fix example
Steem
* Example is tested by doctest
Transactionbuilder
* Example is tested by doctest
Vote
* datetime.now() changed to datetime.utcnow()
* Example is tested by doctest
Witness
* datetime.now() changed to datetime.utcnow()
* Example is tested by doctest
Docs
* Installation instruction improved
* Quickstart created
* Discord channel added to support

steem
* add option use_condenser
steemnoderpc
* refactoring
Graphenerpc
* condenser_api calls shen use_condenser=True is set.
unit tests
* test_comment and test_discussion uses 19.4 nodes now

Memo
* make prefix changeble
Transationbuilder
* sign() return the signed struct now
Graphenerpc
* Session are used for requests
* Singleton for websocket instance added
* Both measures reduce ram consumption when more than one Steem object is created.
Add missing scrypt package to dependency

Account
* get_bandwidth refactored
* get_account_bandwidth added
Cli
* power added for showing vote power and bandwidth
Steem
* Improvements and refactoring for get_config, get_network, get_hardfork_properties, get_current_median_history, get_reward_funds, get_feed_history, get_reserve_ratio and get_dynamic_global_properties
Steemnoderpc
* get_network moved to graphenerpc
Chains
* removed to beemgraphenebase/chains.py
Unit tests
* add unit test for power for cli
* golos test reduced
*

account
* set_withdraw_vesting_route added
cli
 * powerdownroute, convert and interest added
steemnoderpc
* error messages improved
* _check_api_name added
* ApiNotSupported when Api is not supported by node but exists
graphenerpc
* error messages improved
rpcutils
* error messages in sleep_and_check_retries improved
unit tests
* new function added