Added Ajax handler to UserLogin component to validate if user already exists
Added Ajax handler to UserLogin component to validate if user already exists

DenverArtMuseum/OctoberFriends,DallasMuseumArt/OctoberFriends,artsmia/OctoberFriends,artsmia/OctoberFriends,DenverArtMuseum/OctoberFriends,DenverArtMuseum/OctoberFriends,DallasMuseumArt/OctoberFriends,artsmia/OctoberFriends,DallasMuseumArt/OctoberFriends,janusnic/OctoberFriends,janusnic/OctoberFriends,janusnic/OctoberFriends