added controller methods for UsersProducts model based on buyer or seller actions
updated gemfile for deployment
venmo webhook verification setup
Merge pull request #14 from zoe-g/venmo_webhook_setup

Venmo webhook setup
Merge pull request #15 from zoe-g/manage_txn_product_status

added controller methods for UsersProducts
setting up transaction flow
implemented transaction flow, and related updates
reversing some model methods we don't need
Merge pull request #17 from zoe-g/transaction_updates

Transaction updates
added Koala gem for facebook graph
added facebook method to user model.
implementing facebook koala gem, gathering and displaying user friends on product index page.
updated root route to user#new to allow user to sign-in/up before viewing the products#index page.
reverting back to index
fixing merged error
moving get_friends method to user model.
fixing merge errors