Crea

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* Several bug fixes (including issue 13 and 16)
* creaconnect v2 integration added
* token storage added to wallet
* add setToken, clear_local_token, encrypt_token, decrypt_token,
addToken, getTokenForAccountName, removeTokenFromPublicName, getPublicNames added to the wallet class
* url_from_tx add to creaconnect for creating a URL from any operation
* login demo add added
* add -l option to creapy for creating URL from any operation
* add -s option to creapy for broadcasting via creaconnect
* addtoken, deltoken and listtoken added to creapy

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* bug fix and improvements for creapy curation

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* datetime.date is also supported
* creapy curation improved
* owner key is used, when provided and when no other permission is given
* active key is used, when provided and when no posting key is given (post, vote, ...)
* MissingKeyError is raised when a wrong key is set by Crea(keys=[])

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* get_replies() for comments added
* Account_witness_proxy added
* Custom added
* Custom_binary added
* Prove_authority added
* Limit_order_create2 added
* Request_account_recovery added
* Recover_account added
* Escrow_transfer added
* Escrow_dispute added
* Escrow_release added
* Escrow_approve added
* Decline_voting_rights added
* Export option for votes and curation command under creapy added
* getOwnerKeysForAccount, getActiveKeysForAccount, getPostingKeysForAccount added
* Node Class and Nodelist added

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* 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

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* Improve rewards command in creapy
* estimate_virtual_op_num improved and small bug fixed
* CBD 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
* creapy rewards command renamed to pending
* new creapy command: rewards shows now the received rewards