Fix various PEP 8, sytle and PyFlakes issues.
I've also included an exception for E129 in the setup.cfg to make it explicit in the codebase

that this is the expected style.

(%) flake8 -v tests rbtools
flake8.checker            MainProcess    409 INFO     Making checkers

flake8.checker            MainProcess    650 INFO     Checking 79 files

flake8.main.application   MainProcess   2483 INFO     Finished running

flake8.main.application   MainProcess   2484 INFO     Reporting errors

flake8.main.application   MainProcess   2485 INFO     Found a total of 37 violations and reported 0
Note: These violations were in appdirs.py and the docs directory.
time ./tests/runtests.py  

/Volumes/Augie/solarmist/rbtools/lib/python2.7/site-packages/nose/pyversion.py:36: DeprecationWarning: The 'new' module has been removed in Python 3.0; use the 'types' module instead.

  import new

/Volumes/Augie/solarmist/rbtools/lib/python2.7/site-packages/nose/plugins/prof.py:14: DeprecationWarning: The 'hotshot' module is not supported in 3.x, use the 'profile' module instead.

  import hotshot

/Volumes/Augie/solarmist/rbtools/lib/python2.7/site-packages/nose/pyversion.py:49: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x

  class Key(object):

#1 Testing the cache with a high max-age value ... /Volumes/Augie/solarmist/rbtools/rbtools/api/cache.py:479: DeprecationWarning: buffer() not supported in 3.x

  sqlite3.Binary(entry.response_body)))

ok

#2 Testing the cache with a zero max-age value ... /Volumes/Augie/solarmist/rbtools/rbtools/api/cache.py:493: DeprecationWarning: buffer() not supported in 3.x

  sqlite3.Binary(entry.response_body), entry.url,

ok
Ran 210 tests in 215.007s
OK

./tests/runtests.py  93.50s user 60.71s system 71% cpu 3:35.47 total