DDF-748 - Adjusted the customize button to immediately take the user to the next step of the installer.
DDF-758
Adding a features page to the system module that is unfiltered and showing all features in the system.
DDF-745 - Adjusting the installer to only show the application page when in customize mode.

-minor adjustments to ui while I was in.
--Replaced arrow text characters with font-awesome arrows.
--removed the previous button on the last page
--adding a loading spinner when hiding the application tree (only when not customizing)
-removed datatables from our javascript deps.
Merge pull request #31 from McLucas/feature/DDF-745
Merge pull request #32 from McLucas/feature/DDF-748
Merge pull request #33 from jerenhicks/feature/DDF-758_Add_features_tab_to_system_module