press: Add basic press app

Add a couple of admin-editable models, with press release and press
mention models.

These are skeletal at best, but serve as a basis for iteration.
Remove NPM/Node stuff after compile
Quiet NPM install
Clean up post_compile hook

Consolidate a couple of files that really don't need to be separate, and
improve output.
Add CMS picture plugin
Add CMS Google Map plugin