Beem

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* Several bug fixes (including issue 18 and 20)
* fix get_config and get_blockchain_version
* fix get_network

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* Several bug fixes (including issue 17)
* missing steem_instance fixed
* update_account_profile fixed
* update_account_metadata added

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* Several bug fixes (including issue 13 and 16)
* steemconnect 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 steemconnect for creating a URL from any operation
* login demo add added
* add -l option to beempy for creating URL from any operation
* add -s option to beempy for broadcasting via steemconnect
* addtoken, deltoken and listtoken added to beempy

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* bug fix and improvements for beempy curation

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* datetime.date is also supported
* beempy 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 Steem(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 beempy added
* getOwnerKeysForAccount, getActiveKeysForAccount, getPostingKeysForAccount added
* Node Class and Nodelist added