Add device registration service

Add ability to register devices on the web app via API request
Add some additional testing gems
Add registration function and list of registered devices
add the default jonaski admin users
Clean up device registration to return proper status codes

We want device registration to return 200 when registration is successful
and 400 when it is not.
We also want a message to indicate if it was a new registration or
an update to an existing one for informational purposese
remove invalid gcm spec

This spec was only added for testing, so remove it now
Fix the color of all links to be blue

don't like the default black scaffold link color
Force user to sign in to see home and announcement page

The web app is completely private. Force everything to be behind a sigin wall
Dont allow signups. Users must be added by admins
don't display announcements or home page if not signed in
Use the home page to describe progress in the app
Fix typo on home page
Add back devise registration module since it is required
Send gcm messages to all registered devices
Add the download AMS.apk link from S3
Add the pg gem
remove sqlite from production gemfile
fix the db/seeds function
fix for css not loading on heroku