Consider using a navigation helper to determine current page instead of JavaScript

[tylersticka]

trafficstars

Currently, the "current page" is identified using some JavaScript on the client side.

It'd be nice if this could be determined during compilation, so while iterating through nav objects we could check for an attribute (current or active or whatevs) and style things that way.

Low priority, just a thought!

[erikjung]

This relates to #23

[erikjung]

Noting this for future consideration: https://github.com/helpers/handlebars-helper-isActive