added watchers controller, subscriptions model.
added form for users to invite new users
users can be created and added to list of watchers on a user's wishlist
added index to watchers controller/views, redirect invite users to invite watchers
adding ability for users to view lists they are watching. also unexpected end in user.rb line 56
changed routes
users who are watching others users can view wish lists and items in their wish lists
configuring for heroku.