Update README.md
Merge pull request #13 from patrickarlt/master

Readme updates and fix AWS config in gruntfile
close rings when converting
handle compressed geometries
cleanup
cleanup
Merge pull request #16 from patrickarlt/close-rings

Properly close polygon rings when making conversions.
test against results that look reasonable
fix conflict with upstream
Merge pull request #15 from patrickarlt/compressed-geometry

Handle the ArcGIS compressed geometry format
allow converting and parsing null island