Update default search parameters

Sets the bounding box from (-180,-180) to (180,180)

closes #6
latitude only goes from -90 to 90
Update number of search items

There are only 70-ish items available to non-authenticated users of the GIS interface. This bumps the default number of results to 100, without greatly increasing the page load time. Right now, with all the compression, it's only 722k, most of which is eaten up in JavaScript libraries.

closes #12