Revert "added support for rnpm"

This reverts commit f438fa91badd11ed9874776e4483968637b1d799.

package.json

@@ -18,11 +18,6 @@
     "react",
     "android"
   ],
-  "rnpm": {
-   "android": {
-     "packageInstance": "new ExtraDimensionsPackage(this)"
-   }
-  },
   "author": "Jack Hsu <jack.hsu@gmail.com> (http://jaysoo.ca/)",
   "license": "ISC"
 }