* Fix update_account_jsonmetadata and add posting_json_metadata property to Account
* Add Ledger Nano S support
* beempy -u activates ledger signing
* beempy -u listkeys shows pubkey from ledger
* beempy -u listaccounts searches for accounts that have pubkey derived from attached ledger
* beempy -u keygen creates pubkey lists that can be used for newaccount and changekeys
* new option use_ledger and path for Hive

Unit tests fixed

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

Apply fix #42 and #41 from https://github.com/xeroc/python-bitshares