Update Swedish config file to correct translations for 'day' and 'days'. Fixes #112.

Update 'day' and 'days' translations for past dates as well as future dates. Fixes #112.

Update custom locale for Swedish 'day' and 'days' translations and add rspec test.
Merge pull request #113 from MrAlexLau/master

Update Swedish units resource with correct translations for 'day' and 'days' (fixes issue in CLDR v23.1)
Merge branch 'master' of github.com:twitter/twitter-cldr-rb into v3.0
Merge branch 'v3.0' into benchmarks
Conditionally require oniguruma