Add prototype.constructor
Add node test runner
Add travis ci config
Update travis config
Rename BoundingPlane
Refactor constraints to allow index offset
Rename Vec3.get -> Vec3.copy
Add PlaneConstraint

Constrains particles to 3-point plane
Update PlaneConstraint

Cache calculated plane normal vector
Target develop for travis badge
Add test coverage metrics
Add coveralls badge
Improve tests for Vec3
Improve tests for PointForce
Improve tests for AngleConstraint
Improve BoundingPlaneConstraint tests
Simplify DistanceConstraint#setDistance
Fix application of PlaneConstraint with parallel segments
0.3.1
Merge branch 'master' into gh-pages

Conflicts:
	.gitignore