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test(instrument): should return unmodified source if no transform found (#1036)

* Test that the instrument command returns unmodified source if there is no transform found for a file extension.

Currently this behaviour can only be reached when trying to instrument a single file.
In the case of instrumenting a directory, files with an extension with no matching transform are filtered out before they can be instrumented.

* Cleanup instrumentation code again with a focus on paths

The main aim of this has been to clarify whether we're working with relative or absolute file paths, and removing unnecessary transformations.  Although I've made a few other 'small' changes here and there.

Key changes:
	* Created a new private method `NYC._transform`, common to `_maybeInstrumentSource` and `instrumentAllFiles`.
	* Renamed the param in `walkAllFiles` forEach handler to `relFile` to explicitly state the file representation being used.
	* Let the `addAllFiles` visitor function rely on `testExclude` to determine which files to instrument

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