Manage Favorites/Subscriptions from Web

use http://tba.com/account/mytba

Should also be linked from the account overview page
When we add a favorite, we send a GCM notification to devices telling them to update with the new data. This parameter tells the backend which device added the favorite so we don't send a notification to a device where it isn't necessary.
But, when we add one from the web, that doesn't have a GCM ID, so we don't need that parameter.