Update README.

Link to travis on cscott repo; it's not enabled on mediawiki repo.

Use `npm` package banner.

Change-Id: If9eea017ce73fa6b77d6bf98e2091f023bc2d76e
Remove unused dependency on `request` package.

This was used in `mw-ocg-bundler` before the refactor and split.

Change-Id: I39143400b653e4b236a0005e278e4346e92e6232