Patch to make installable in pip>=10

1.2.5

Bump version for pip 10 fix in last commit (#11)

1.2.2: vectorize line intersection (#7)

* vectorize line intersection

* fix lint

* bump versiom

1.2.1: Speedup mesh_xsection more (#6)

Speedup of mesh xsection.

Speed up mesh xsection

1.2.0

minor version bump was slightly wrong

1.1.1: Fix mesh_xsection (#4)

* Fix mesh_xsection

* fix lint

* Fix bug in mesh_xsection that manifested with large meshes

* fix lint

* failing test for the case of non-watertight meshes

* fix the multiple open paths bug

* fix lint

* bump version

* Allow polylines to convert to Lines with a color specified

1.1.0

Value class imported from Core

1.0.2

fix premature import of lace

1.0.1

Fix setup

1.0.0: Initial move over from core (#1)

There's a bunch of general math utilities in core that Mesh will depend on, core depends on. More, there's a bunch of stuff that depends on core in part just because it needs these generic math utilities. So this seemed like a good first thing to break out.

This PR is really all structural, there are no interesting changes in the actual implementations.