Upgrade form-data, add back browserify compability. Fixes #455.

package.json

@@ -25,7 +25,7 @@
     "bl": "~0.9.0",
     "caseless": "~0.8.0",
     "forever-agent": "~0.5.0",
-    "form-data": "~0.1.0",
+    "form-data": "~0.2.0",
     "json-stringify-safe": "~5.0.0",
     "mime-types": "~1.0.1",
     "node-uuid": "~1.4.0",