UMA AS implementation

The following was updated:
1. AS configuration  .well-known/uma-server
2. MIT KIT logo and some other updates to AS web appearance
3. new test users

4. new table resource_set and supporting code
5. new resorce_set_registraction endpoint and supporting code

6. Verify PAT validity before producing rssID and populating DB

7. Record resource owner's information in the DB

8. For resource set registration create ETag/_rev and record it in DB