[WIP] use gulp-umd instead of browserify-shim #25
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Bundles created using browserify-shim do not work in AMD enviroments. https://github.com/eduardolundgren/gulp-umd creates proper UMD wrappers and should be able solve problems like JedWatson/react-select#270.
I don't have much experience with browserify/gulp/node, but this is what I've come up with.
However, when trying the changes on react-select, I end up with an empty dist file.