Remove most of index.js, uncouple unit-tests.

index.js
	-Remove all of the file's (placeholder) code.

test/run.js
	-Uncouple `stream.js` and `interpolator.js` from the unit-tests,
	and neither is relevant after the removal of `/interpolator.js`
	(e572bce).
	-Leave the files themselves in the repo for reference.