Fixes #4012: Converts sync management and sync schedule routes into resources delcarations.

This is needed in order to fix an issue with 3.2.8 and the declaration
of menu's in lib/katello/plugin.rb against Foreman. Rails 3.2.8 is provided
by RHSCL 1.0 and the menu system fails unless a resource for the main
route is delcared via the resources method.
Assets: These changes reflect required fixes for assets to properly
compile on RHEL6 with the current RHSCL packages used for asset compilation.

Most notably the current versions of therubyracer (0.11.0beta5) and
uglifier (1.2.6).
Merge pull request #3562 from ehelms/fix-assets-rhel6

Assets: These changes reflect required fixes for assets to properly
Merge pull request #3563 from ehelms/fix-plugin-routes

Fixes #4012: Converts sync management and sync schedule routes into reso...