DDF-669 DDF-670 DDF-682

DDF-670 - Restyles the admin application modules.  Setup initial application selection page for Jeren and Sam's work.

DDF-669 - Created Feature management backend API and Feature UI via
config plugin.

DDF-682 Created configuration plugin API framework.  Adjusted
configuration UI to work within a Configuration Plugin.
Yes, please refer to the guidance on this page: https://tools.codice.org/wiki/display/DDF/Development+Recommendations

It is a work in progress and we need to get better at keeping it up to date but it should be helpful.