Publish stable and in-development versions of the Infusion Docs

Currently only the in development ( master ) branch is publish. We should implement a means of publishing the latest stable release documentation alongside the in development docs. This will likely mean moving off of GitHub pages and into a self hosted environment.

Currently by default docs.fluidproject.org redirects to http://docs.fluidproject.org/infusion/development/ We'll probably either want to have a landing page where a user can select which version ( stable / dev ) to view or provide some other means of easily navigating between the two.

see: https://wiki.fluidproject.org/display/fluid/Post+Infusion+2.0+Review+Meeting+Notes