Remove the call to `TDTRandomDouble` from Testing Additions

Removes the only code dependency between the subspecs.
Remove unnecessary assert from Testing Additions
State explicit dependency between Foundation and Core Data additions
Update CHANGELOG
Merge pull request #49 from talk-to/straighten-interspec-dependencies

Straighten interspec dependencies
Merge remote-tracking branch 'origin/master' into more-candy-from-hush

Conflicts:
	CHANGELOG.md