resolves #179; creating resized image copies on the Media model on save.
Merge branch 'master' of github.com:18F/peacecorps-site into imageprocessing
bugfix--Media.save() should only resize images.
decoupling image resizing from Sir Trevor settings.
moving the image resizing test to peacecorps since we're doing it on the media model.
Merge branch 'master' of github.com:18F/peacecorps-site into imageprocessing
removing sir trevor's image processor, since the media model is processing images.
Merge branch 'imageprocessing' of github.com:annalee/peacecorps-site into savesirtrevor