updating chipmunk to 6.1.3
tweaks to get ext to build
dropped ppc arch flag
pulled latest bindings from beorans 6.x branch
update extconf to only build x86_64 arch on mac; not sure the correct way to build 32 vs 64 bit ruby extension
moved constraint c files to top level
got rid of compiler warnings; updated body and spec
fixed slerp; slerpconst still broken
fixed slerpconst spec
updated version spec
keep list of group keys with incrementing int vals because object id is too large
changed shape group to use object to int lookup hash
added gc marking of obj2int hash
shape spec is running
added Poly.box that takes w/h or bb
moved bias, slop, and persistence getter/setters over to Space where they should be. Got constraint spec passing
updated constraint spec; pivot joint can now take a pivot or 2 anchors; groove joints grooves are now accessible
fixed rubygems warning by using https
added helper for testing accessors; specs for DampedSpring
use rspec helper properly