Rakefile: read version.yml and set WindowsZone version only if it's not set
Rakefile: For data files - always use LF line endings and UTF-8 encoding
Rakefile: Improve messages when updating data
README: Clarify contributing steps, `rake export` needs to be run
Add `rubyzip` development dependency which is required for CLDR extracting
Update TZInfo, Timezone Abbreviations and Countries
Update CLDR, Metazones and Timezones
Update Rails Zones
Update Windows Zones and Offests
`en_Dsrt` locale was removed from CLDR so change it to fix tests
Update tests for changes in Timezone data
Update Version to 0.1.2