remove therubyracer from the gemspec

Change-Id: Ic3fac70355a3b5113d5520afd6d6c84c780b73b7
Explicitely reuqire spree backend/frontend

We override stuff from them, may as well make sure we include them

Change-Id: Id70115b61cc394675a10a99aee78c6d207b466fb
Cleanup/style fixes

We'll need to pay attention to the paperclip changes when we deploy, but
there was no reason to change the defaults

Change-Id: I7580cedf798bc5bbf27f7ee81a9813cf1adab1a1