optimize circle/circle broadphase
Merge branch 'master' of https://github.com/schteppe/p2.js
added GridBroadphase, circles demo runs at about 2x speed
gridbroadphase optimize
gridbroadphase now ignores out-of-bbox bodies
optimizations
plane broadphase tricks
opt
opt
Grunt building.
Spacing lint.
Use options objects to set properties on World, Body, and Spring.

This allows for a very nice way to set every property on an object if
desired.
Changed the default gravity to -9.78
Merge pull request #3 from Fishrock123/master

Lets get some grunt building in here!
Removed p2.js from the root directory.
Merge pull request #7 from Fishrock123/options

Use options objects to set properties on World, Body, and Spring.
Merge pull request #8 from Fishrock123/master

Remove p2.js from the root directory.
Bodies no longer require a shape.

Updated the "springs" demo to be particle-less.
Merge pull request #9 from Fishrock123/gravity

Change the default gravity to -9.78
Merge pull request #11 from Fishrock123/bodies

Bodies shouldn't require a shape.