Create messages.is.js
Icelandic translation.
Merge pull request #27 from saevarom/master

Icelandic translation file.
German translation
- updated doc. Added onFieldSuccess listener. Refs #17
Merge pull request #28 from p0wl/master

German Translation
- changed behavior with keyup when a field is validated. Now, once a field has a validation class, every keyup is triggered to update class asap. Refs #7