bump dependency versions and remove benchmark transpilers

package.json

@@ -34,7 +34,7 @@
     "test": "make test"
   },
   "dependencies": {
-    "commander": "2.3.0",
+    "commander": "2.4.0",
     "fs-readdir-recursive": "0.0.2",
     "lodash": "2.4.1",
     "mkdirp": "0.5.0",
@@ -44,21 +44,16 @@
     "recast": "0.8.0",
     "source-map": "0.1.40",
     "regenerator": "0.6.7",
-    "chokidar": "^0.9.0",
-    "source-map-support": "^0.2.7",
-    "esutils": "^1.1.4",
-    "acorn": "^0.9.0",
-    "ast-types": "^0.5.3"
+    "chokidar": "0.10.0",
+    "source-map-support": "0.2.7",
+    "esutils": "1.1.4",
+    "acorn": "0.9.0",
+    "ast-types": "0.5.3"
   },
   "devDependencies": {
-    "es6-transpiler": "0.7.17",
     "istanbul": "0.3.2",
     "matcha": "0.5.0",
     "mocha": "1.21.5",
-    "traceur": "0.0.67",
-    "esnext": "0.11.1",
-    "es6now": "0.8.11",
-    "jstransform": "6.3.2",
     "uglify-js": "2.4.15",
     "browserify": "6.1.0",
     "proclaim": "2.0.0",