test: rename r5js.test.Evaluator => r5js.test.JsInterop.
misc: prefer native bind to goog.bind where possible.
test: move output port creation from r5js.test.main to SchemeTestDriver.
scm: simplify test output format to allow JS parsing.
submodule: bump tdd to receive tdd.ManualTestSuite.
test: make r5js.test.SchemeTestDriver a manual test suite.
io+misc: r5js.CallbackBackedPort: extract string conversion from impl.
Makefile+test: make test output verbose by default.