Account
* Json export improved
* All times are converted to datetime
* Doku about ignore for muting improved
* Accounts and AccountsObject added
* mute for Mute another account added
* get_muters and get_mutings added
CLI
* refactoring of follows and following
* muter and muting for showing muted and muting accounts
* mut added
* doku for unfollow improved
Comment
* json() improved
Unit tests
* test_account adapted to steemit/steem bug for appbase
* test_json_export added
* test for muter and muting for cli added