OP-323 API method for listing versions of PresideCMS
OP-323 Creating a release json file along with every zip file

This is so that the update manager can read version information for each version without needing to download the full zip
OP-326 API for retrieving the currently installed version of PresideCMS
OP-326 Basic UI scaffolding for UI Manager. Currently displaying current version of PresideCMS
OP-327 UI and APIs for viewing update manager settings
OP-327 Ability to save update manager configuration settings (which update branch to fetch from)