* Documentation is pretty sketchy.
* More test cases.
* AUTOLOADed get methods:
	- document them better
		+ can auto-generate much of this using ->format_signature 
	- ensure they can be called as get_X and get_Y where X is the microformat class/rel name, and Y is the hash key from ->data
	  which sometimes differ.
		+ make sure any such differences are clearly documented
