Implement suggestions from #1 & #2
Typo (Thanks Justin!)
Options are...optional
Remove redundant cast to string
Add placeholder specs
Fix constant name
Add specs for CallControllerMethods
Ignore missing string translations
Fix specs
DRY
DRY specs on suggestion from @benlangfeld
Clarify intent
Ensure locale is sticky across call controllers
Clarify "fallback text"
Even a little more DRY
Merge pull request #5 from adhearsion/feature/audio_path_lookup

Implement suggestions from #1 & #2