* Use validator.js instead of regexp for validations in User Schema.
* Disables "Unexpected console statement no-console" warnings
* Fixes redirection to wrong URL after login with social networks.
* Use ViewModel vm instead of $scope in manage social accounts controller.
* preserving the option to redirect to a specific URL as done in saveOAuthUserProfile() (thanks to @OneOfTheWorld for pointing out)
A state parameter was added for the routes that require user authentication. Now, everytime a statechange occurs, the destination state is checked and user is redirected to signin page if necessary. Note the state parameter is added within `data`, so that nested states can inherent its value.
