when both `HIVE_CHAIN_ID` and `STEEM_CHAIN_ID` returns valid IDs, Hive is selected as a network.

* Add option add_tor to config storage, which allows it to use beempy in tails
* Remove Events requirements, beem.notify and beemapi.websocket, as it is not well tested and there are no websocket api nodes available on hive
* Remove unnecessary requirements (pylibscrypt and future)

* Add new operation ids for HF 24
* Remove remaining py2 code
* Run unit tests on beta.openhive.network
* Fix compatibility issues with HF 24
* account get_follow_count, get_followers and get_following have been fixed

* new beempy chaininfo command
* Automatic chain detection (beempy will now connect to unkown chain ids)

* Improve chain detection (Steem chain detection fixed and preparing for Hive HF24)
* Add authored_by and description fields in YAMLM header
* Improve doc
* beempy post image upload includes the markdown file path now

* add account get_notifications and mark_notifications_as_read
* beempy notifications has been added
* bridge api support added
* config storage improved and add get_default_config_storage, get_default_key_storage and get_default_token_storage
* list_all_subscriptions and get_account_posts added
* image upload url fixed for HIVE
* reduce number of performed api calls on Steem object creation

* Fix non ascii text handling on some nodes
* Add STEEM_REVERSE_AUCTION_WINDOW_SECONDS_HF21 constant
* Fix get_curation_rewards

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