additional Vec2 functionality
Merge pull request #7 from szymonkaliski/master

additional Vec2 functionality
Added simpleDistance also to Vec3
Reuse already computed length in Vec2.limit()
Added limit to Vec3
Reordered sin and cos in Vec2.setAngle

In order to follow math convention from Wikipedia and Wolfram
Renamed angle to direction in Vec2
Fixed handling angles > 270 in Vec2.direction
v0.8.0
Improved Geometry.clone
Added Geometry.merge
Added Geometry.transform
v0.9.0
Added npm ignore
v0.9.1
Added missing return this in lerp
v0.9.2