wip(): teaching $translate asynchronicity
Merge branch 'fallback-languages' of https://github.com/Sanjo/angular-translate into sanjo

* 'fallback-languages' of https://github.com/Sanjo/angular-translate:
  Async translations with multiple fallback languages
Merge branch 'fallback-languages' of https://github.com/Sanjo/angular-translate into sanjo

* 'fallback-languages' of https://github.com/Sanjo/angular-translate:
  Failing test for: it should load a fallback language asynchrously only once
  Documented the new code for async translations with multiple fallback languages
fix missing semicolon
fix fallback languages flattened
Merge pull request #307 from tspaeth/fallback-languages

fixing fallback languages a bit
wip()
wip()
wip()
fix: resolved value for langPromises is undefined