Added Pre-Rendering support

Developers could just set 'contentPreRendered' to true
and Routr will grant that the content inside 'targetContainer'
node will be the current rendered html.

Also, its possible to define the startup module to be
loaded aside the pre-rendered html content.

routr.initialize({
targetContainer: "#container",
baseUrl: "/knockeout",
contentPreRendered: true,
preRenderedModule: "inicio",
debug: true
})