Update Python 2 and PyPy

* CPython 2.7.9
* PyPy 2.4.0
* meinheld==0.5.7, greenlet==0.4.5
* Fix nginx config.
Not a fan of this.

Would it be possible to add this to an environment variable so that nginx has access to it? Something like `LD_LIBRARY_PATH` or `PATH`?