V0.2: RoleBindings, Status and other additions

Changelog:

• Updated the paas-site-operator service account to use cluster-admin role since I was hitting a lot of the times problems of permissions, might change later on back to a specific Role and ClusterRole;
• Operator started using and updating the Status of the CR;
• Default node selector is now being assigned to projects and is configurable;
• Admin RoleBinding is now being created and updated when the owner changes;