* Adapt version number in doc

* estimated_mana is now capped by estimated_max
* print_info fixed()
* get_api_methods() and get_apis() added to Steem

*Skip estimate_virtual_op_num when max_virtual_num is smaller than batch_size
* reverse is removed from estimate_virtual_op_num
* it is assured in history and history_reverse that the estimated start is really before or after the given one.

* configuration improved
* beempy help for each command added

* Renamed getSimilarAccountNames to get_similar_account_names
* Fix doctest for account, profile, steem and utils

Account
* Examples and Dokumentation improved
Amount
* Example improved
Asciichart
* Examples improved
Blockchain
* examples improved
Discussions
* Doku improved
Market
* Examples and Doku improved
Price
* Examples improved
* Missing steem_instance fixed
Steem
* Example code fixed
Graphenerpc
* Example improved

Formatting of all doc parts improved
Logo and icon added
Doc structure improved
quickstart improved

Account
* Example forget SimilarAccountNames  added
* Example for history and history_reverse improved
Amount
* Example is tested with doctest
Block
* Example is tested with doctest
Price
* Fix example
Profile
* Fix example
Steem
* Example is tested by doctest
Transactionbuilder
* Example is tested by doctest
Vote
* datetime.now() changed to datetime.utcnow()
* Example is tested by doctest
Witness
* datetime.now() changed to datetime.utcnow()
* Example is tested by doctest
Docs
* Installation instruction improved
* Quickstart created
* Discord channel added to support

account
* follow and unfollow improved
cli
* newaccount, importaccount, orderbook, buy, sell, cancel, openorders, resteem, follow, unfollow, witnessupdate and witnesscreate added
steem
* witness_update added
witness
* update uses steem.witness_update
unit tests
* new cli functions added to unit tests test_cli