* Fix bug in ecda (convert mpz into int when not supported)

* 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 participation_rate to Blockchain
* beembase.transactions is deprecated
* get_block_params added to TransactionBuilder

wls v2.5 reward / posting example

This reverts commit b86e513f.

* Improve file reading for beempy sign and broadcast
* add option to write file for beempy sign

* add claim_account RC calculation
* fix Bytes type
* Improve testnet example
* test_types improved

Example for using offline signing is provided
Next release prepared

Fix unit test

Snapshot
* update_in_vote added 
* enable_votes changed to enable_in_votes and enable_out_votes
* build_rep_arrays added
Example
* account_vp_over_time added
* account_reputation_by_SP added
Discussion
* check if parameter exists in discussion_query added

CLI
* upvote and downvote fixed
Snapshot
* refactoring
* update_vote and build_vp_arrays added for showing vote power history
Examples
* account_vp_over_time added

* get_data is now fast
* update_rewards added
* enable_rewards added to build
* build_curation_arrays added

Snapshot
* impoved and STEEM and SBD history added
* Documentation added
* get_data, reset, build functions added

Snapshot added
* This class can be used to access old account states. At the moment, only changes in vests are tracked over time.
* example added for plotting SP over time

Steem
* last_node added and refresh of json_config data is forced on node switch

Example
* A cache performance evalution script was added to examples
Blockchain
* set_cache_auto_clean disabled

* stream_threading_performance example added to evaluate threading
* _switch_to_next_node added to Steemnoderpc
* 5 tags restriction removed from post()

Blockchain
* Check if all block could be fetched added
* Thread and Worker class for block fetching added

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

* added use_stored_data to all steem function that uses constants e.g. get_config()
* Fix author for steem.post(), when a account object is entered
* **kwargs added to all broadcast function of steem
Account
* fix desribtion of update_account_profile
* added update_account_metadata

steem
* add steemconnect in init, when set, steemconnect is used for broadasting
steemconnect
* new class can be used to broadcast operation with steemconnect v2
storage
* Token class to store encrypted token
Transactionbuilder
* use steemconnect broadcast with set in steem
Wallet
* add token storage class
* add setToken, clear_local_token, encrypt_token, decrypt_token, addToken, getTokenForAccountName, removeTokenFromPublicName, getPublicNames
Example
* Add login app for testing steemconnect

NodeList
* replaces get_node_list from utils.py
* is a list and contains all nodes as dict
* get_nodes() returns the url in a list
Utils
* get_node_list removed
Unit Tests and Examples adapted to the changes