change log for geom2d

geom2d, release 2011.06.30
==========================

Changes 
- re-organized the library in three sub-directories: geom2d, polygons2d, and
    polynomialCurves2d
- cleanup of code and doc

New functions
- added function drawOrientedBox
- added function pointSetBounds, that computes bounding box of a set of points
- added function pointSetsAverage
- added function minimumCaliperDiameter
- added function isPointInTriangle
- added function findPoint

Changes
- function intersectLinePolygon now returns unique intersections
- enhanced intersectLinePolygon
- enhanced polygonSelfIntersections

Bug fixes
- general code and doc cleanup
- fixed bugs in polygonLength and parametrize