Engine: Namespacing controllers.
Engine: Namespacing helpers.
Engine: Namespacing mailers.
Engine: Namespacing models.
Engine: Namespacing app/lib.
Engine: Namespacing views.
Engine: Namespacing assets.
Engine: Cleaning up lib.
Engine: Adding namespace pathing to stylesheet imports.
Merge pull request #3170 from ehelms/engine-namespace

Engine namespace