Update gruntjs.d.ts

Everything in IGruntConfig is optional.
Merge pull request #549 from basarat/patch-2

Update gruntjs.d.ts
Added animation() signatures to IModule

AngularJS 1.1.4 now has animation support baked into the framework, as outlined here:

http://www.yearofmoo.com/2013/04/animation-in-angularjs.html

API documentation can be found here:

http://code.angularjs.org/1.1.4/docs/api/angular.Module
Suggestion: jQuery overloads for jQuery UI's method overrides
Merge pull request #551 from brettpostin/patch-1

Added animation() signatures to IModule
Merge pull request #552 from thomasandersen/jquery-overloads

Suggestion: jQuery overloads for jQuery UI's method overrides