gulp-eslint fix (#128)
gulp-eslint fix (#128)

* Clean up the parameters that are passed to the handler

* Linting fixes

* Review feedback.

* Adjust sw-lib tests to work with the changes to a handler's params

* Listen for the 'data' event with a no-op handler

GoogleChrome/workbox,GoogleChrome/workbox,GoogleChrome/workbox,GoogleChrome/workbox