Improvement: Agnostic URI Protocol Declaration

Hi NielsLeenheer,

How's it going? I guess my commit comment is quite explanatory :)

Using // instead of http:// or https:// will be avoid warning messages from the browser. Specially Microsoft Internet Explorer which is sensitive to load http elements over a https page. For further information: http://tools.ietf.org/html/rfc3986

Hope you'll find it useful.

Cheers,

E.