Updated box2d, underscore, sugar

box2dweb-2.1.d.ts -> JSDoc
sugar-1.3.9.d.ts -> JSDoc (in progress)
sugar-test.ts (added)
underscore-typed.d.ts (1.4.4, JSDoc)
underscore-typed-1.4.3.d.ts (JSDoc)
underscore-typed-1.4.2.d.ts (JSDoc)