Gulp support

[robballou]

Integrate with gulp somehow? I haven't made a gulp plugin before and so I'm unsure the steps needed to make this work (or what changes to the code may need to happen).

Initial thought of how this look code-wise:

gulp.task('rotate', function() {
    gulp.src('.')
      .pipe(rotatelib.pipe({
        before: '-2 weeks'
      })
      .pipe(rotatelib.removeItems());
});

[robballou]

• This may not make sense for a gulp plugin. It can happen within a gulp task if needed without it.
• Globbing may be an interesting thing, though (allowing more than one directory with a glob instead of an array of locations). It would also add a way of potentially filtering without using rotatelib's criteria.

So ... still thinking about this one! 💭

If you have opinions, speak up, let me know.