CMS-1819 Convert content_find to use value objects

- added SpaceNames.from( final Collection<String> names ) method that is present in other XxxNames
- added pojo classes for all facet types
- added content summary  and content summary list jsons
- altered content get to return full jsons,content list and find return summary jsons
- updated test with find
Merge pull request #344 from enonic/cms-1819

CMS-1819 Convert content_find to use value objects