Add ordinal support for dutch (nl) locale

It is not perfect yet, but it is a start.

I did not know exactly how to fix these problems:
42nd = 'tweeenveertigste', but should be 'tweeënveertigste' (this goes wrong because 42 = 'tweeenveertig' is also wrong)
131st = 'honderdsteéénendertigste', but should be 'honderdéénendertigste'
133rd = 'honderdstedrieendertigste', but should be 'honderddrieëndertigste'
1000st = 'éénduizendste', but should be 'duizendste' (this goes wrong because 1000 = 'éénduizend' is also wrong)
4256th = 'vierduizend tweehonderdzesenvijftigste', but should be 'vierduizend tweehonderdzesenvijftigste'

For some correct examples (only in Dutch) see: http://woordenlijst.org/leidraad/6/9