[AC-3744] facebook login bug

When user(anand@nisostech.com) registers using arrowdb using api then it create account for that user (perfect), but if user logins from his facebook account with email address (anand@nisostech.com) then arrowdb create new account for that facebook user. Arrowdb don't map facebook user with user who has already register with similar email id. fb login using arrowdb external account https://api.cloud.appcelerator.com/v1/users/external_account_login.json?key=&pretty_json=true request : type:facebook, token:EAADoNzpziVMBABK9kc4wXcV9e5pIo7LO0XswkOthz5xZCUqpUZAcCC9DDu2S0NJi28p3fiwzD7zuITJZAIK1uh7TIKDAmrultfZBju1noVkbwtX4ibbeLAy8pb2TZCVS6NDfye8X3xzAKX6NqyTdFDeLpYef0NOYu3UkX5Yxv5gZDZD response : { "meta": { "code": 200, "status": "ok", "method_name": "externalAccountLogin", "session_id": "Cbmqwd3XXFydg4sD0RV2BZOW3bY" }, "response": { "users": [ { "id": "5747f35b04f995090a8de505", "created_at": "2016-05-27T07:12:27+0000", "updated_at": "2016-06-06T08:13:28+0000", "external_accounts": [ { "external_id": "168807353521580", "external_type": "facebook", "token": "EAADoNzpziVMBABK9kc4wXcV9e5pIo7LO0XswkOthz5xZCUqpUZAcCC9DDu2S0NJi28p3fiwzD7zuITJZAIK1uh7TIKDAmrultfZBju1noVkbwtX4ibbeLAy8pb2TZCVS6NDfye8X3xzAKX6NqyTdFDeLpYef0NOYu3UkX5Yxv5gZDZD" } ], "confirmed_at": "2016-05-27T07:12:27+0000", "email": "", "admin": "false", "stats": { "photos": { "total_count": 0 }, "storage": { "used": 0 } }, "friend_counts": { "requests": 0, "friends": 0 } } ] } } create user using arrowdb create api https://api.cloud.appcelerator.com/v1/users/create.json?key=&pretty_json=true request : first_name:abc, last_name:xyz, email:anand2@nisostech.com, password:12345, password_confirmation:12345 response : { "meta": { "code": 200, "status": "ok", "method_name": "createUser", "session_id": "EerdcRGqdUVRTaqzil32uLxd8wM" }, "response": { "users": [ { "id": "5755314204f9959307dbff31", "first_name": "abc", "last_name": "xyz", "created_at": "2016-06-06T08:16:02+0000", "updated_at": "2016-06-06T08:16:02+0000", "external_accounts": [ ], "confirmed_at": "2016-06-06T08:16:02+0000", "username": "anand2@nisostech.com", "email": "anand2@nisostech.com", "role": "teacher", "admin": "false", "stats": { "photos": { "total_count": 0 }, "storage": { "used": 0 } }, "friend_counts": { "requests": 0, "friends": 0 } } ] } }