Beem

-------
* Several bug fixes
* CLI improved
* wait_for_and_get_block refactoring (Thanks to crokkon)
* Bug fix for blockchain.stream(), raw_ops added
* Fix and improve estimate_virtual_op_num
* Support for New Appbase Operations format

-------
* Improve rewards command in beempy
* estimate_virtual_op_num improved and small bug fixed
* SBD value in Comment always converted to Amount
* accuracy renamed to stop_diff
* Doku of estimate_virtual_op_num improved
* Unit test for estimate_virtual_op_num added
* beempy rewards command renamed to pending
* new beempy command: rewards shows now the received rewards

-------
* Block have only_ops and only_virtual_ops as parameter
* transactions and operations property added to Block
* entryId changed to start_entry_id in get_feed, get_blog_entries and get_blog
* estimate_virtual_op_num() added to Account, can be used to fastly get account op numbers from dates or blocknumbers
* history and history_reverse uses estimate_virtual_op_num()
* blockchain.ops() is obsolete
* only_ops and only_virtual_ops added to blockchain.get_current_block(), blockchain.blocks() and blockchain.stream()
* reward, curation, verify added to cli
* new curation functions added to the Comment class
* Signed_Transaction.verify() fixed, by trying all recover_parameter from 0 to 3
* get_potential_signatures, get_transaction_hex and get_required_signatures added to Transactionbuilder
* KeyNotFound is replaced by MissingKeyError and KeyNotFound is removed

-------
* Several small bugs fixed
* cache which stores blockchainobjects is now autocleaned
* requests.session is now a shared instance
* websocket will be created again for each Steem instance
* A node benchmark which uses threads added to examples
* Documentation improved
* Optional threading added to beempy pingnode (use --threading with --sort)

-------
* bug fix release

-------
* AsciiChart for beempy: pricehistory, tradehistory and orderbook
* Sort nodes regarding their ping times (beempy ping --sort --remove)
* currentnode and nextnode skip not working nodes
* Memory consumption fer requests and websocket reduced when creating more instances of steem
* trade_history added to market
* Issue 4 fixed
* Steem(use_condenser=True) activates condenser_api calls for 19.4 nodes