Updating multiple definitions files

* box2dweb-2.1.d.ts (latest)
* sugar-1.3.9.d.ts (latest)
* sugar-test.ts (added)
* underscore-typed-1.4.2.d.ts
* underscore-typed-1.4.3.d.ts
* underscore-typed-1.4.4.d.ts (latest)