Detect pyOpenSSL

Some people use pyOpenSSL (it is the literal name, e.g.: https://pypi.python.org/pypi/pyOpenSSL)

correct usage comment

Update README to reflect new buildpack:set usage

Prefer a 'manage.py' that exists higher up in the directory hierarchy

Upgrade pip and make netrc github work

[1]: https://github.com/timshadel/heroku-buildpack-github-netrc

Update Readme.md to python-2.7.9 and python-3.4.3

This reverts commit 3c283914.

extend LIBRARY_PATH

http: update all external links to use secure protocol.

Update Readme.md to pypy3-2.4.0