change the visibility to PathComponentIntersection

fix unit tests

Merge pull request hfutrell#94 from hfutrell/intersection-via-implici…

…tization

Intersection via implicitization

increment version #

Merge pull request hfutrell#85 from hfutrell/public-bernstein

Public bernstein

bump version #

fix accidental deletion of conditonal compilation.

add code coverage step back to travis.

increment version #

Merge branch '0.6.6-release' of https://github.com/hfutrell/BezierKit …

…into 0.6.6-release