Test failure fixed

1. To test test\spec\measuredunitSpec.js added conversion function to be
passed into model, beacuse model has no idea of conversion otherwise
2. All measures were translated to english
3. Changed number of rivets binded number due to task

4. Added field defaults to the model
5. Fixed initialize method. Now ignores undefined/null options values
and uses defaults in this case
6. Fixed unitChanged function. If we set Unit field initially from the
outside of model via model.set() this event should not be triggered