expand REST JsonUtils to better determine whether things can be jsonified;
and create similar (better) mechanism as part of Jsonya
(next commit will remove JsonUtils as it will be replaced by Jsonya routines)
remove rest project's JsonUtils class in favour of Jsonya support for converting things to nice json primitives,
and add javadoc to Jsonya
remove STATUS_JSON sensor as STATUS_BSON serialises as JSON map now through the rest api
Merge pull request #1124 from ahgittin/json

improve how we return json via the rest client, with jsonya support for translating objects to json primitives