dutch translation

Created dutch (nl-NL) translation including the national holidays for 2014.
(2015 will be different dates for i.e. easter)
Update nl-NL.js

updated easter and related holidays. The easter+49/easter+50 (Pentecost) are a bit sketchy... due to the fact that it could be +49 OR +50..
Update nl-NL.js

fixed spacing
updated index files to point to the dutch translation
Merge pull request #205 from fruitl00p/master

dutch translation