Add Norwegian support to Numeral-js

Added Norwegian numerals, which is equal to the Danish ones.

Language tag according to http://www.w3.org/International/questions/qa-choosing-language-tags

Norwegian bokmål "nb" and Norwegian Nynorsk "nn" languages are written languages, but Norwegian "no" is the spoken language. IANA calls it a macrolanguage, numerals are common to all three. Hence the choice of "no".