Show password editing field on settings page if it was ever set
OAuth users can set a password on their settings page if desired
Fix config issue causing JS to not be minified in production

Since upgrading to Rails 4, the config.assets.compress
option is deprecated in favor of config.assets.js_compressor.
So we haven't been minifying our JS since May. whoops

Refreshed the config/* files to look more like they should
for a Rails 4.1 app, including secrets.yml etc.
Bootstrap 3 upgrade

* Change column classes to be all that 'col-md-n' business instead of 'spanN'
* Change modals to have some extra classes
* Plop in the new simple_form_bootstrap wrapper stuff
* Start restyling event/rsvp forms