DB changes for images
Initial controller changes for image uploads
Updated/cleaned up views for showing images

Removed photos/index since I'll just redirect to users#show

Also added carrierwave bit to convert to a default image size for
initially displaying.  This takes care of trying to display really
large files by default (it's not that pretty that way).
Added validation on Photo#file_name
Resized the photo forms to be smaller
Merge pull request #3 from turboladen/carrierwave

Added carrierwave for uploading images