routing: Cleanup URL routing and improve page matching. * Add new types of route parameters for integers (int4, int2, int). * Remove hard-coded hacks around converting year/month/day values. * Make the blog post routes use the new typed parameters. * Fix problems with matching routes with integer parameters when they can get confused with a sub-page number.

<ul class="nav navbar-nav navbar-right">
    <li><a href="{{ pcurl('getting-started') }}">Getting Started</a></li>
    <li><a href="{{ pcurl('docs') }}">Documentation</a></li>
    <li><a href="{{ pcurl('api') }}">Code</a></li>
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</ul>