Add getEntity to grunt perf
update format
Add async formatValue and formatEntity methods
Add async format tests
Reverse the order of arguments passed to Resolver.format
Fix tools/format
Fix tools/perf
Throw more errors
Fix throwing tests
Add attrs: null
Bug 1095120 - Asynchronous mozL10n.formatValue. r=gandalf
Follow-up to async format*: don't silence notfounderror listeners
Bug 1108099 - Make formatValue wait for Context.isReady. r=gandalf