Fix hotbar centering - Update inventory-window, voxel-inventory-hotbar

deathcap/inventory-window@96a03d60cdf81d3747f301a50f24359b1d9fdc84 Fix widthpx calculation with new borders
deathcap/inventory-window@73f9dc5d7745936b1d1b8f40aea601822f949dcc Revert "Halve default border thickness"
deathcap/inventory-window@b96b84bf5fb24adc96e14a6a287372ee5fd60ef9 Halve default border thickness
deathcap/inventory-window@a1fe17fb5a9bbc1e334b286ea10edd84ace3d689 Remove outer overall border, double edge borders instead
deathcap/inventory-window@d6601569da53fa80025e6c43471f99cf1d07242d Update demo to CoffeeScript 1.7.0
deathcap/voxel-inventory-hotbar@635264968a246e733e40bcc3fe31b43863fc7499 Fix horizontal centering of hotbar DOM node on page. Closes GH-3

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