upgrade ast-types, add rimraf

package.json

@@ -34,7 +34,7 @@
     "test": "make test"
   },
   "dependencies": {
-    "ast-types": "0.5.0",
+    "ast-types": "0.5.2",
     "commander": "2.3.0",
     "fs-readdir-recursive": "0.0.2",
     "lodash": "2.4.1",
@@ -56,6 +56,7 @@
     "jstransform": "6.3.2",
     "uglify-js": "2.4.15",
     "browserify": "6.0.3",
-    "proclaim": "2.0.0"
+    "proclaim": "2.0.0",
+    "rimraf": "^2.2.8"
   }
 }