Saves user_id to cookie on signin/signup
Adds button to allow logged in user to connect to Venmo
Adds angular venmo service for connecting to venmo
Adds venmo service to dashboard controller; includes venmo service script in index.html
Adds cookieService; includes script in index.html
Adds cookie service; signin/up uses service to save cookies
Updates dashboard controller to use cookie service
Fixes typo on dashboard controller
Merge pull request #47 from arkadyp/venmologin

Adds cookie service to record user_id and session token