add more python version in travis and tox. #73
remove unittest2, since it brokes on py3
only install unittest2 on python 2.6 and 2.7
add coveralls
Add base OAuth2 Client to documentation
Fix formatting in OAuth 2 Client docs
Use HttpLexer
clean whitespace, fix blank lines according to pep8
Merge pull request #163 from lepture/code-style

clean whitespace, fix blank lines according to pep8
Merge pull request #161 from dasevilla/base-client-docs

Document Base OAuth 2 Client
Merge pull request #158 from lepture/travis

add more python version in travis and tox. #73