bug 997919: AUS should have a no-index robots.txt. r=rail
bug 994419: Requesting data of non-existent release yields a 500 error. r=rail
bug 999423: tracebacks on versions like 3.6.3plugin1. r=nthomas
Bug 748698, Support new attributes for update.xml in Balrog, r=bhearsum
Merge with latest upstream