make Poly cimportable
expose more chipmunk functions, cpvlerp
make Segment cimportable, allow changing of radius - UNTESTED
Merge pull request #27 from chozabu/segment_support

make Segment cimportable, allow changing of radius
expose shape layers to python
Port most operators in pymunks Vec2d over
segment endpoints return Vec2d
segment accepts tuple or vec2d
Vec2d can clone other vectors with constructor
add cpvrotate and cpvunrotate from pymunk
port two pygame demos from pymunk
copy several more Vec2d functions from pymunk
store offset in Circle, add getter
ported arrows demo from pymunk, along with pygame_util (into examples, not main lib)
port two more examples over from pymunk, using sprites with pyglet and pygame
port static Vec2D methods from pymunk
added some basic info to readme
renamed README to README.md for github
ported point_query example from pymunk
add cpSpaceNearestPointQueryNearest as space.nearest_point_query_nearest