Beem

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* Add option add_tor to config storage, which allows it to use beempy in tails
* Switch from pyyaml to ruamel.yaml
* Remove Events requirements, beem.notify and beemapi.websocket, as it is not well tested and there are no websocket api nodes available on hive
* Remove unnecessary requirements (pylibscrypt and future)
* add new node (fin.hive.3speak.co) and change change rpc.esteem.app to rpc.ecency.com
* Replace diff_match_patch by difflib and add unit tests
* Increase timeout and retry count in beempy
* Remove obsolete replace_hive_by_steem parameter
* skip_account_check added to account.transfer and account.transfer_to_vesting

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* Add new node (https://hive-api.arcange.eu)
* Fix logic in RankedPosts and AccountPosts
* Fix feed_publish

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* Fix beempy witnessfeed for HF24
* Fix more hbd renaming in beempy
* improved RankedPosts class
* New AccountPosts class for account feed and more
* Comment class has been cleaned up, use_tags_api has been replaced by api
* Add check if get_account_votes is still supported (is dropped in HF24)
* New SupportedByHivemind exception has been added
* Fix issue 263

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* assumes that a rpc server uses appbase

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* Add hbd_interest_rate to beempy witnessproperties
* Add beempy listdelegations (thanks to crokkon)
* fix account_name assignment from dict in get_account_reputations() (PR 259)
* Add new operation ids for HF 24
* Remove remaining py2 code
* Run unit tests on beta.openhive.network
* Fix compatibility issues with HF 24
* account get_follow_count, get_followers and get_following have been fixed
* improved get_discussions calls, fallback to condenser when tags api not available
* Fix detection when content does not exists on HF24
* Fix detection when a vote does not exists on HF24

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* Support for update_proposal_operation (thanks to dkedzierski)
* Remove not needed SECP256K1 import
* Fix corner case last_irreversible_block_num == head_block_number for Transactionbuilder (thanks to dkedzierski)
* import keyring only when needed
* Add use_condenser to config (can be set wtih beempy set), when set to False, condenser calls are not used
* Add set_expiration to Object Cache
* Use floor instead of round in beembase/Amount in order to handle floats which have a higher precision than allowed
* json_str parameter has been added to beembase.Amount, when True, a json dict is returned as string (needing when broadcasting with use_condenser=False)
* Handle deleted comments in beempy pending thanks to crokkon