Return output in bytes.
Do not encode sent data.
Fix parsing and unparsing length.
Encode username and password in RouterboardAPI.
Fix RouterboardResource.
Refactor resources.
Refactor.

Rename RosAPI methods.
Extract writing and reading lenght to separate class.

Prepare to support python < 3.2
Fix pep8 and pyflakes violations.
Merge pull request #1 from pazur/master

Python3.3 compatibility.
Py2/3 compatibility.