Test relationship capability, WTD-1007.
Add a service to wrap Date.now(), such that this can be injected (simplifying testing of scripts which need to respond to system time.) Specifically supports staleness indication, WTD-660.
Add skeleton specs for platform/core, WTD-573.
Bring in bundle platform/core from the sandbox branch, in preparation for clean up, tests, and integration. WTD-573
