removed [NyaruCollection insert:]
removed [NyaruDB collectionForName:]
replaced `union` as `or`.
fixed the typo.
added tests for NyaruKey, NyaruIndex and NyaruIndexBlock.
added test for NyaruSchema.
added tests for SchemaType
added the test for NyaruSchema.allKeys.
added tests for NyaruSchema.
cleanup NyaruQueryCell.h
added tests for NyaruQueryCell.
added tests for NyaruQuery.
added tests for NyaruQuery
refactor tests for NyaruSchema.
added tests for NyaruQuery
added tests for NyaruQuery
added the submodule ocmock
added the test for NyaruQuery.
added tests for NyaruQuery
added the test for NyaruQuery.