Add task for ordering translations
Drop the usage of commentPreambleFile in favor of tx-order-translations
Add task tx-push-translation-key for pushing single translation keys to Transifex
Merge pull request #3 from futurice/feature/order-translations

Feature/order translations
Add error messages when no resources or keys found for processing
Merge pull request #4 from futurice/feature/push-single-translation

Added tx-push-translation-key task
Unify param handling for tx-add-resource
Unify tx-add-instruction task parameter handling
Add resource parameter to tx-add-instruction task

Additionally drop unused transifex.mainResourceSlug config option