Load the whole certificate chain.

Proxies generated with MyProxy can have a really long chain. We
need to load the whole certificate chain so that it can be properly
validated and the VOMS info correctlty extracted.

Closes #1
Added documentation for PyPI and fix typo in setup.py
Fix import to align with latest grizzly code. Changed versioning schema.

 - The configuration has to be imported from oslo, so we change that.
 - Changed versioning schema to use the same as Keystone.
Merge pull request #3 from alvarolopez/master

Fix import to align with latest grizzly code. Changed versioning schema.
Fixed duplicate entry for vomsapi_lib

It was mixed with the line about autocreate_users.
Merge pull request #8 from bhagemeier/master

Fixed duplicate entry for vomsapi_lib in documentation