Check if there is already an account that isn't linked to a google account but uses the google accounts email address
Merge branch 'master' of https://github.com/robjohnson189/hackathon-starter into robjohnson189-master

* 'master' of https://github.com/robjohnson189/hackathon-starter:
  Check if there is already an account that isn't linked to a google account but uses the google accounts email address
Updated flash message in Google Strategy
Check if there is an account with a given email address when linking GitHub strategy.
Update Google Strategy
Check if there is an account with provided email when linking with Facebook strategy
Updated formatting