make addVertex append before the closing point
add Polygon.hasHoles() and Polygon.holes()
update docs for new methods and behavior
Merge pull request #240 from kenichi/holes

add Polygon.hasHoles() and Polygon.holes()
Merge pull request #239 from kenichi/polygon_add_vertex

make addVertex append before the closing point
Merge pull request #241 from kenichi/doc

update docs for new methods and behavior
Merge pull request #238 from JerrySievert/master

update ready for release
Merge branch 'master' of github.com:JerrySievert/Terraformer
Merge branch 'master' of github.com:Esri/Terraformer