CAMP server

added a sandbox repo which provides partial compliance to CAMP Server.

also some refactoring and additional utilities elsewhere to make this process easier.

to test the sandbox camp server you will need to build brooklyncentral/camp-server (and note that this in turn depends on the latest build of this pull request).  then just run BrooklynCampPlatform and point your rest client (dev-http-client plugin for chrome is good) at   http://localhost:8080/camp/v11  -- then explore.

comments on this extension -- and more generally on camp-server structure very much appreciated!