Initial commit and begin to move over to real libopenpg
Reimport poly2tri library
A few minor fixes to poly2tri 3rd party library

- #include <cstddef> to get NULL defined
- Depend on cython >= 0.14.1, not ==0.14.1
At least graphs work again, and better than before.
Another milestone, got auto detection of holes working.
Add Makefiles for poly2tri, also move contour logic to seg class
Merge remote-tracking branch 'openpg/master'

Initial commit of the code into this repository's layout
Update the readme with sufficient KEEPOUT messages