Update dependencies

Ref. #10.

Author: mathiasbynens

package.json

@@ -21,18 +21,18 @@
     "url": "http://github.com/estools/esshorten.git"
   },
   "dependencies": {
-    "estraverse": "~1.5.0",
+    "estraverse": "~4.1.1",
     "escope": "~1.0.1",
-    "esutils": "~1.0.0"
+    "esutils": "~2.0.2"
   },
   "devDependencies": {
     "chai": "*",
-    "commonjs-everywhere": "0.8.x",
-    "jshint-stylish": "~0.1.5",
-    "gulp-mocha": "~0.4.1",
-    "gulp-jshint": "~1.4.0",
-    "gulp": "~3.5.2",
-    "coffee-script": "~1.7.1"
+    "commonjs-everywhere": "~0.9.7",
+    "jshint-stylish": "~2.0.1",
+    "gulp-mocha": "~2.1.3",
+    "gulp-jshint": "~1.11.2",
+    "gulp": "~3.9.0",
+    "coffee-script": "~1.10.0"
   },
   "licenses": [
     {