Investigate possibly PyPy and Jython support

[ib-lundgren]

Investigate whether it would be useful to add PyPy and Jython support and what would be necessary for it to happen. As far as the OAuthLib code goes neither should be an issue but that might not be the case for the dependencies.

The biggest concern is likely to be PyCrypto.

I vaguely remember seeing threads about issues with that combination but not sure about the current status.

Jython could be tricky, there might be wrappers or suitable alternatives but needs some research.

[dahlia]

PyCrypto currently works on PyPy, and oauthlib also currently works on PyPy. (Tested on PyPy 2.0.2, Mac 10.8.3.)

$ tox -e pypy
GLOB sdist-make: /.../oauthlib/setup.py
pypy inst-nodeps: /.../oauthlib/.tox/dist/oauthlib-0.4.1.zip
pypy runtests: commands[0]
.....................................................................................................................................................
----------------------------------------------------------------------
Ran 149 tests in 0.846s

OK
___________________________________ summary ____________________________________
  pypy: commands succeeded
  congratulations :)

I think we could add pypy to tox.ini and .travis.yml files. (.travis.yml seems not to contain even 2.6, 3.2 and 3.3.)

[lepture]

I don't think Jython worth the work.

[ib-lundgren]

@lepture Agreed, Jython is not going to be worth it.

@dahlia Cool to know that pypy seem to work tho, feel free to send a PR adding it to tox.ini =)

Travis is currently setup to run tox which tests 2.6, 2.7, 3.2 and 3.3, which is not obvious since the travis yaml file only mentions 2.7.