Fix tests so they all pass with CLDR v24

With this PR all tests does pass for CLDR v24 (#21 required). Actually there's one test (time_test.rb:39:"z, zz, zzz") which depends on system's timezone so that will fail with other timezones than CET.

Also I think it wasn't good idea to test exact values against CLDR as it's not that improtant, better would be just check few cases as CLDR data is being updated. Anyway this time I just updated data to match CLDR.