Release 0.1: Code-cleanup, Python 2.7 compatibility, Result-class renames (optional)

• remove unnecessary lines, pretty-up the code where possible
• check that it works with Python 2.7
• regarding Result-class renames, I think the methods should be verbs, at the past tense: The result of this operation was that it has succeeded or it has failed.

It would look easier to read in english IMO:

# do something -> result
if result.failed():
  # handle failure