adds user model and authentication with devise
Adds user model and authentication through devise. Renames
public/index.html to public/production_index.html and adds a capistrano
task to switch it back to index.html on deploy.
Merge branch 'authentication' of github.com:steve8/softandfluffynotes into authentication
runs rename production_index.html task on deploy:cold
adds flash messages and basic drying of auth spec