crontab.tpl: execute cron gc during low traffic time.
switching to python27: modify jenkins build scripts (bug 1013867)
use pyquery when checking markup to not fail on attributes reordering (bug 1013867)
Script conversion from Serbian Cyrillic to Latin (20140607)
Update amo-validator
use `select_related(related_names)` instead of deprecated `select_related(depth=1)` (bug 1023010)