codereview: fetch metadata using JSON API, not XML scraping
codereview: fetch metadata using JSON API, not XML scraping

Fixes hg clpatch.

R=golang-dev, r, r
CC=golang-dev
http://codereview.appspot.com/4524045
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go