Start refactor to use promises instead of async
and callbacks. Fix author url in package.json.
Finish refactor to Promises.
toS3's final step returns a resolved object (with
message key) instead of just the message string.
New uploadIfNotAlreadyOnS3() with tests.
Move stag quote-stripping function to etagLookup().
Rework 'exports' to make test stubs easier.
Add new path --strip option. Plus tests.
(not hooked up yet)
Refactor to determine inputPath and outputPath
as the first step, plus support new --strip option.
Refactor tests.
Document --strip option.
Add --prepend option to adjust outputPath on S3.