include more logging
assert some invariants, which will log in production when not met.
Also removed an unsed PCH, moved the PCH out of Classes
// FREEBIE
Incidentally:
* Use podspec to determine dependencies
* Since AxolotlKit pod is a dev pod dependency of the AxolotlKit
test-harness app, removed the redundant include of AxolotlKit files
from the AxolotlKit test-harness app.
// FREEBIE
