Moved shape constructors into Primitives for easier look-up.
Added solid=true to all two-dimensional shapes.

Using instanceof to determine if the shape is a polygon seems like a horrible
cancer from the past. Even more if can be achieved with such grace.
Removed id-list comments in upload.html.

Now that the same .replace().match() sequence is applied in three places I'll
probably have to move this into a lib.
Formatted erica output to an 80x24 term in README.md.
Added line-comment support to README.md.
Added couchdb-ogr2ogr support to README.md.
Added Search Performance section to README.md.