Add browserify recipe

I've struggled a bit getting Browserify+Gulp+Uglify to all play well together and [issue #369](https://github.com/gulpjs/gulp/issues/369) generated a lot of discussion and some excellent examples of how to do it properly (at least until 4.x comes out). 

This PR is attempting to distill that conversation into a simple recipe that anybody can use.

Thanks @contra @sogko for posting great snippits in the thread.
cant you `var pkg = require('./package.json');` instead of requiring twice? I know it's cached but it causes extra visual clutter