Minor Tweaks / Asset pipeline adjustments

# What's New?

 * That S3 upload test controller I made for Simon to test on used the incorrect controller notation, which was destroyed by minification on production
 * Some users were having issues with the `app_environment_variables.rb` file, so I now raise a descriptive runtime exception when someone trys to run the app without that file.

# What's Next?

 * Still need to integrate paperclip with uploads
 * Need to trim down asset pipeline (foundation plugins, mostly)

Prefer single-quoted strings when you don't need string interpolation or special symbols.