Addressing issue #28.
Addressing issue #28.

A bug in Polygon.holes, was returning a list of vertices.  Should have been returning a list of lists of vertices.


jlaura/pysal,sjsrey/pysal_core,lixun910/pysal,darribas/pysal,schmidtc/pysal,chhao91/pysal,sjsrey/pysal,lanselin/pysal,badjr/pysal,TaylorOshan/pysal,ljwolf/pysal_core,badjr/pysal,lixun910/pysal,dfolch/pysal,dfolch/pysal,ljwolf/pysal,ljwolf/pysal,hasecbinusr/pysal,darribas/pysal,pedrovma/pysal,hasecbinusr/pysal,ljwolf/pysal_core,hasecbinusr/pysal,spreg-git/pysal,ljwolf/pysal_core,ljwolf/pysal,TaylorOshan/pysal,spreg-git/pysal,pastephens/pysal,pastephens/pysal,chhao91/pysal,nathania/pysal,weikang9009/pysal,schmidtc/pysal,sjsrey/pysal_core,pastephens/pysal,nathania/pysal,sjsrey/pysal_core,jlaura/pysal,jlaura/pysal,lixun910/pysal,TaylorOshan/pysal,pysal/pysal