Make the linked resource files protocol agnostic

The linked resource files such as CSS and JS would not load in the browser over SSL. I tested the theme over SSL connection using Chrome 34.0.1847.116 and got the following error in console.

![screenshot 2014-04-17 17 26 43](https://cloud.githubusercontent.com/assets/1987473/2738586/0fc1f31c-c691-11e3-926e-8d5f73af8ca0.png)

I removed the http:// protocol from all the external resources to fix the protocol dependency.

More info [here](http://www.paulirish.com/2010/the-protocol-relative-url/)