Add angular-facebook as a bower dep
Facebook reward changes

- use new endpoint /user/add_facebook to link user's facebook
- then call claim with only username/updateToken
- use angular-facebook
facebook reward changes

- link their facebook account if they haven't yet
- just update their facebook account auth token if they have
isFacebookReady scope function returns Facebook.isReady
call function
Address comments
Add errors to claim facebook reward
Merge branch 'master' into use-add-facebook-endpoint
Handle already linked errors
Remove console log
Merge pull request #941 from stellar/use-add-facebook-endpoint

Use add facebook endpoint