angular.d.ts IDocumentService extends IAugmentedJQuery

Updated IDocumentService to extend IAugmentedJQuery rather than Document. As per the API (http://docs.angularjs.org/api/ng.$document) it provides "A jQuery or jqLite wrapper for the browser's window.document object."
Merge pull request #1875 from scottmcarthur/patch-2

angular.d.ts IDocumentService extends IAugmentedJQuery