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
resolved routes conflict
merging in facebook friend methods

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built model to get your fb friends' open listings
Merge pull request #21 from zoe-g/friends_sales

built model to get your fb friends' open listings
added redirect and post request to venmo
fixed conflicts and merged tim's updates to paperclip
updating redirect to products page once user signs in/up.
Merge pull request #23 from zoe-g/tims_merge_paperclip_fix

Tims merge paperclip fix
adding facebook photo to navbar when user is signed in
added link to navbar for user to add a product.
fixing navbar so add product link only shows for sign in user.
venmo auth working