User manual rewrite

This commit represents a fairly large rewrite of the page hosted at:

http://mapstory.org/mapstory/manual

It includes descriptions of the StoryTeller and MapStory pages, as well as a tutorial describing how to go from a shapefile to a MapStory. Due to the evolving nature of the MapStory interface, there are no images contained in this page.

This page will likely require some more review, but it feels like it's in a good enough spot to merge in for now.