Issue #89, migration needed for table UserRating

Id column has to be available for correct insertion of records.
Merge pull request #135 from DevYah/C3_MahmoudHashish_#89_user_ratings_migrations

Issue #89, migration needed for table UserRating
added migration for users' photos
added necessary changes to user model
Merge pull request #136 from DevYah/C4_Hesham_Add_Photo_User

C4 hesham add photo user
Merge branch 'master' into C1_Sameh_#76_twitter_sharing