Fix polygon conversion to boost::geometry.

The conversion wasn't correctly handling the `SEG_CLOSE` command,
and was not setting the counter-clockwise flag correctly on the
polygon type.
Added tests for non-simple polygons.

Note that one is currently disabled (commented out) pending a fix
upstream.

Conflicts:
	test/adminizer.cpp
Merge pull request #22 from MapQuest/adminizer_non_simple_polygon

Support non-simple polygons