Bug 926408 - Import mozcrash 0.9 from upstream

--HG--
extra : rebase_source : ca4b5152e0a15116dea5fd37ccb231fbb542079d
Bug 925739 - Rename cx->names().classPrototype to just cx->names().prototype, for readability/predictability.  r=jorendorff
Bug 925705 - Fix mismatched logging define check. r=honzab