Trigger simple hashchange events
Summary
When the URL hash changes, trigger a #?key event on the window.
Benefits
This makes it easier for developers to write URL-driven applications.
To change state, just add <a href="#?key=val" class="urlfilter" data-target="#">
To respond to state, don't use $('a').on('click'). Instead, use $(window).on('#?key').
Usage
For example, if the URL changes from /page to /page#?state=Goa, you can listen to $(window).on('#?state', function(state) { ... }) will be triggered with Goa as the state.
It will also trigger $(window).on('#?', function(url) { ... }) where url is a g1 parsed URL.
To enable this, just run $(window).urlchange(options).
Instead of window, we can run this on iframes and any other urlfilter target too.
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