Implement updated resource descriptor

@sheavalentine-mdsol @fosdev @jcarres-mdsol FOR DISCUSSION since tests are still failing
Please review: 
1) simplified registry;
2) dealiasing functionality;
3) dereferencing functionality - including options
4) misc fixes to make it work with crichton-demo-service -  detail_decorator;
5) removed magic strings and move them in KeywordsHelper;

It is expected to have failing specs. Some other specs are also failing. For some reason getting:
Real HTTP connections are disabled. Unregistered request: GET http://alps.io/schema.org/Array.