Fixed subscription bug.
Subscription/unsubscription works good now
Merge branch 'JeffBranch' into NewMojioClient
Fixed reference to Newtonsoft.Json in core project
Now the user's devices are subscribed for tow by default
Added unit test project
Added AbstractNotification and UserPrerference unit tests
Fixed tests
Made it so pressing back at main menu doesn't bring you back to login page
Merge branch 'master' of github.com:rockyhe/MojioTowingAlert