0.5.0 docs
added remaining 0.5 docs
Merge remote-tracking branch 'origin/gh-pages-0.5.0_docs' into gh-pages
0.5.0 documentation is revised. Now includes proper categories and deprecation
These doc changes expose the 0.5.0 docs and ensure you are only looking at one
documentation version at a time. We added in a version switcher, and then
cleaned up all the jekyll data we weren't using.
Added support for a "draft" version, allowing us to release docs early
This allows us to get docs onto the main website much faster under a
draft design.