wip(cid): adding tests and code about it
wip(cid): several fixes around cid instead of id
fix(cid): all tests green; corrects local tests by using #localFindCid: istead of (the now deprecated) #localFindId:
increases version
changes main version
receives the id from server after saves; evaluates #onAfterSave: and #onAfterCreate: before the then callback (and if successful)
Merge pull request #3 from flow-stack/feature/cid-and-id

Feature/cid and
adds #testSerializationWithIdentityPreservation showing the problem
adds #testSaveWithIdentityPreservation also showing the problem
fixes(asJSON): the onAboutToJSON method is now obsolete