Refactor + RingAssignment request working

Refactored misspelled RingAssignment classes/methods. Updated
ApiAccessor makePostRequest; removed unused methods
code cleanup of unused items
Added queries for overviews using new breed ring assignments. Not yet used.
Fixed SQL typos and connected new BreedRingOverview query
removed old BreedRingOverview query
If debugging local, request all shows on server
Conformation rings & assigns requested in batch

Also deleted old ring request classes
Addressing lint errors

Fixing trivial lint errors. Updated Gson reference
[lint] replaced empty xml body with end tag
[lint] fixed errors and added a few javadocs