fix(dragula): using typings and removed require usage

closes #100

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ng2-dragula",
-  "version": "1.1.2",
+  "version": "1.1.3",
   "description": "Simple drag and drop with dragula",
   "repository": {
     "type": "git",
@@ -86,4 +86,4 @@
     "webpack": "^1.12.13",
     "webpack-dev-server": "^1.14.1"
   }
-}
+}

src/app/directives/dragula.directive.ts

@@ -7,7 +7,7 @@ import {
   SimpleChange
 } from 'angular2/core';
 import {DragulaService} from '../providers/dragula.provider';
-import * as dragula from 'dragula/dragula';
+import * as dragula from 'dragula';
 
 @Directive({
   selector: '[dragula]'

src/app/providers/dragula.provider.ts

@@ -1,4 +1,4 @@
-import * as dragula from 'dragula/dragula';
+import * as dragula from 'dragula';
 import {Injectable, EventEmitter} from 'angular2/core';
 
 @Injectable()

src/vendor.ts

@@ -8,4 +8,4 @@ import 'angular2/core';
 
 // Other vendors for example jQuery, Lodash or Bootstrap
 // You can import js, ts, css, sass, ...
-import 'dragula/dragula';
+import 'dragula';

typings.json

@@ -3,6 +3,7 @@
     "jasmine": "github:DefinitelyTyped/DefinitelyTyped/jasmine/jasmine.d.ts#dd638012d63e069f2c99d06ef4dcc9616a943ee4"
   },
   "ambientDependencies": {
+    "dragula": "github:DefinitelyTyped/DefinitelyTyped/dragula/dragula.d.ts#e8bdd1be7c8a81dcf9f4cdae126690c7bf249501",
     "es6-shim": "github:DefinitelyTyped/DefinitelyTyped/es6-shim/es6-shim.d.ts#6697d6f7dadbf5773cb40ecda35a76027e0783b2",
     "node": "github:DefinitelyTyped/DefinitelyTyped/node/node.d.ts#aee0039a2d6686ec78352125010ebb38a7a7d743"
   }