Fixed ett/et gramatical error in nb-NO resource file

When counting "one",  "ett" should be used instead of "et"
Fixed ett/et gramatical error in nb-NO resource file

Added some tests for timespan in nb-NO locale. Fixed ett/et errors in
the resource file
Added future DateHumanize localizations to nb-NO

Added nb-NO localizations for the DateHumanize_*sFromNow that was
missing from the nb-NO resource file. Added tests to acompany the
settings.
Added tests for timespans>1 in nb-NO
Removed redundant empty lines
Updated release_notes.md with pull req 137
minor tidy up
Merge branch 'norwegian'