Card 605 Add link user with gigya
Card 605 add unit tests
Merge branch '0.9.0-wip' of https://github.com/stackmob/stackmob-js-sdk into f/605-linkuserwithgigya

Conflicts:
	test/spec/unit/SocialSpec.js
Card 605 add linkUserWithFacebook unit test
Merge pull request #56 from stackmob/f/605-linkuserwithgigya

Card 605 Add link user with gigya