include underscore as a dependency for npm

package.json

@@ -1,6 +1,6 @@
 {
 	"author": "Hakim El Hattab",
-  "name": "Reveal.js",
+	"name": "reveal.js",
 	"description": "HTML5 Slideware with Presenter Notes",
 	"version": "1.5.0",
 	"repository": {
@@ -11,6 +11,7 @@
 		"node": "~0.6.8"
 	},
 	"dependencies": {
+		"underscore" : "1.3.3",
 		"express" : "2.5.9",
 		"socket.io" : "0.9.6",
 		"mustache" : "0.4.0"