Preliminare work on common classes for generating and shortening UUID strings.
Merge branch 'master' into uuid-shortening
UuidConverter operable and preliminary tests pass.
Enhanced UuidConverter to support expansion of short UUID forms with padding (e.g. "==") at the end.
Converted UuidConverter from needing allocation to foreign static methods. Renamed StringToUuidAdapter to UuidAdapter.
Introduced MongodbUuidEntityRepository and related support classes.