Android theme color

As per [this article](http://updates.html5rocks.com/2014/11/Support-for-theme-color-in-Chrome-39-for-Android), you can set the Android tab color for your site with a simple meta tag. Nothing like a hint more personality on the mobile web.

![theme-color-ss-9950fd13a0c52b32b6bd580309d55a6b](https://cloud.githubusercontent.com/assets/1730309/5206692/b7cc7ebc-7571-11e4-8f32-1e9e12c56469.png)


cc @Shopify/fed