Added invalidAt function to get invalid unit index

isValid is boolean, so its not very helpful in determining which section of
a date is wrong. inavlidAt returns the index of the broken token, where 0 is
year and 6 is millisecond.
Moment creation defaults to current date
Make jshint happy
Update nb.js

Change the long date format, so that it follows the most common Norwegian system for dates (DD.MM.YYYY). Ref. http://en.wikipedia.org/wiki/Date_and_time_notation_in_Norway.
Fixed the unit test for the Norwegian language configuration
Merge pull request #915 from ichernev/features/invalid-at

Added invalidAt function to get invalid unit index
Merge pull request #949 from tkallevik/patch-1

Change the Norwegian language configuration to follow the most common date format
Merge pull request #912 from ichernev/feature/create-defaults-to-current-date

Moment creation defaults to current date