Make jshint compile + Upgrade to Phaser v2.0.3

Hi there,

your boilerplate is awesome, i'm going to use it for LudumDare 29,
I've forked your boilerplate to update Phaser, also I found to be more relevant to externalize Phaser dependency, so I've made [my own Phaser repository](https://github.com/gre/phaser) which is require()-able with proper p2 and Pixi.js dependencies (because now, it wouldn't be possible to do the full embedding/wrapping like you did with the latest Phaser : it contains itself some require() which would break a `require("./phaser.dev.js")` - also it totally make sense to externalize the p2 and Pixi.js deps, e.g. if you also want to use p2 in a standalone way, and that's just one among all the benefit the browserify approach brings...)

Also I wish Phaser to be a standard npm package soon in the future so it can replace my temporary repository... BTW I've just asked @photonstorm https://twitter.com/greweb/status/457592642315243520

Regarding my changes, feel free to take or ignore my PR ;-) This boilerplate is helpful for me at least ;-)

Best regards,
@gre