Added pep8 tests.
Added Python 3 check to tox.
Merge pull request #6 from jw/master

Added pep8 and python 3.3 check
add newline to the end of file
add python 3.3 to classifiers.
Update version: add python 3.3 to classifiers.
Merge branch 'master' into develop
use tox environments in travis config file
merge with develop