Beem

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* Fix is_steem

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* Fix chain detection

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* Improved community selection in beempy createpost
* Improved Transactionbuilder object representation
* _fetchkeys function moved outside appendSigner
* Fix get urls in parse body
* Two more nodes have been added to nodelist
* new beempy chaininfo command
* Automatic chain detection (beempy will now connect to unkown chain ids)

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* replace percent_hive_dollars by percent_hbd (to make beem HF24 ready)
* Remove whaleshares related code
* Fix adding of a wif in beempy
* Remove SteemConnect
* Fix set token in HiveSigner
* Add Blurt
* Add Community for community reladed requests and broadcasts
* Improve community lookup for beempy createpost
* Improved beempy history command output
* Improved beempy stream

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* add get_replace_hive_by_steem() to Hive(), for transition from HF23 to HF24 on HIVE
* Replace HIVE by STEEM and SBD by HBD only when Hive HF < 24
* Replace steem and sbd parameter names for Hive HF >= 24 by hive and hbd
* Add get follow list to Account (only for HIVE and HF >= 24)
* Add BLURT, SMOKE and VIZ chain_id
* Remove not used STEEM chains (STEEMZERO and STEEMAPPBASE)
* Improve chain detection
* rshares_to_token_backed_dollar, get_token_per_mvest, token_power_to_vests, token_power_to_token_backed_dollar
and vests_to_token_power have been added for chain independent usage
* New beempy command followlist, which can be used on HIVE to receive info about follow lists
* Fix beempy info on Hive
* Use Hive() on beempy when setting default_chain to "hive"
* Simplify chain identification
* Fix more Token symbols in beempy
* Fix unittest and add more unit tests

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* Fix encrypted memo decryption
* from_account and to_account in Memo() can also be a publick and private key
* Prepare for sbd/steem replacement by hbd/hive
* Add unit test for beem.memo
* Use reputation api
* Add Server error to _check_error_message
* Fix trx_id generation when sign return none
* Retry up to 5 times when coingecko price api failes