Merge pull request #166 from geertweening/develop

[DOC] update README install instructions
Fix undefined fee states when connecting to a rippled that is syncing
[BUG] Fix Amount.to_human_full()
* Amount.is_native is a function, but was referenced as a bool.
* Duplicate to_text_full tests to test to_human_full.
Merge pull request #167 from ximinez/ripd-549

[BUG] Fix Amount.to_human_full()
[DOC] update release notes
[TASK] bump version to 0.8.1-rc3
[TASK] bump version to 0.8.1
[FIX] crash on server error

for the cases when there's no listener to the error event on the server
fix by having the remote listen to the error events of the server and emitting an error event itself when there are more than 0 listeners