Bts-tools

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* [bts,steem] complete revamp of the feed logic
WARNING: this is API incompatible with the previous versions. Check config.yaml doc
* [bts] added feed publishing for GOLOS, HERTZ, and a bunch of new feed providers

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* [bts] fixed feed publishing for bit20
* [bts] enable feed publishing for all markets by default, no more black-swanned markets

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* [bts] added Uphold and Binance feed providers
* refactored feed providers plugin system to be more easily extended

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* fixed issue when no BitcoinAverage credentials are provided
* fixed issue with feeds being published every time they are checked

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* API CHANGE: config.yaml has changed substantially and previous versions will NOT work
documentation is at: https://bts-tools.readthedocs.io/en/latest/config_yaml.html
* finalized port to generic graphene code, full support for the following chains:
bts, bts-testnet, steem, ppy, ppy-testnet, muse
* general code improvements and optimizations, documentation update
* [bts] added Fixer, CurrencyLayer, Quandl, AEX, ZB, Livecoin as feed providers

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* [ppy] new default p2p port for PeerPlays