libgdx/libgdx — pull request #1916 by davebaol (2014-05-30 14:34:23+00:00)
Title: Added setZero method to Vector interface.

Of course one could use `v.sub(v)` where v is declared as Vector, but `v.setZero()` is more readable IMO.
Also `setZero` falls in line with `isZero` which already exists.