Adding playMixID and playURL

Adding support to play via mixID and play via URL
Fix PEP8 errors, combine play methods

Fix the PEP8 errors from last commit.
Consolidates the other playURL and playMixID commands into one play
command. This does make the assumption that we always return 10 results
from search.
This should be made into a config param and used it in both places.
(api.py and client.py)
Merge branch 'master' of https://github.com/dbrgn/orochi
Fixing spelling mistake

Found a typo in one of the help messages.
Handling exceptions

Added exception handlers for the URL attempts.
Updating AUTHORS :)
Fix typo for True

Python doensn't have a 'true' it's True.
Style changes

Updates relating to readability and consitency throughout the code.
Merge pull request #23 from mindstorms6/master

Adding playMixID and playURL