Adds microformats2 export format

Adds a microformats2 export format which exports each point as an [h-geo](http://microformats.org/wiki/h-geo) entry. 

Example output:

```html
<p class="h-geo">
	<span class="p-name p-summary">Palio</span>
	<data class="p-latitude">45.5088</data>
	<data class="p-longitude">-122.64899</data>
</p>
<p class="h-geo">
	<span class="p-name p-summary">Cellar Door Coffee</span>
	<data class="p-latitude">45.50871</data>
	<data class="p-longitude">-122.65471</data>
</p>
<p class="h-geo">
	<span class="p-name p-summary">Ford Food &amp; Drink</span>
	<data class="p-latitude">45.50481</data>
	<data class="p-longitude">-122.65499</data>
</p>
```