added comments to split up the source a bit
replaced filenames/URLs with filename/URL building functions
added a beta/devel switcher
tweaked presentation of the switcher links
latest version of the dev docs
Merge branch 'download-page-updates' of https://github.com/ManageIQ/manageiq.org into download-page-updates
readying download workflow for Anand RC
Merge pull request #150 from ManageIQ/download-page-updates

Download page updates