emit 'file' event for import dependencies

[mattdesl]

Using watchify, you will not get a re-bundle if you make a change in a CSS dependency - i.e. a style sheet that was brought in with an import() statement.

The solution for this tool is to emit a file event when a new dependency is discovered. See here and here.

Related:
mattdesl/budo#57

[cheton]

Hi mattdesl,
Thanks for your reminding. I will check it out!

[cheton]

The solution is included in v0.7.1
https://github.com/cheton/browserify-css/releases/tag/v0.7.1

Also see at https://github.com/cheton/browserify-css/blob/master/css-transform.js#L121

that.emit('file', absFilename);