Added 'assignUser', 'removeUser', 'allowCurrentUser'
Add access rule for adduser action method of project controller and deny all access rule as a last access rule in 'accessRules' method
Added 'actionAdduser' method for adding new user
Added 'getUserRoleOptions' and 'isUserInProject' methods
Added 'actionAdduser' method or assigning users to projects with particular roles
Added view for adding users to project and for assigning them particular roles
Form for assigning roles to users