Add year option to configuration
Use itunes-client 0.1.4
Apply year option to update track attributes
Move progress bar logic from dvd.rb to main code
Break early if `ignore_convert_sound` option is active
Change default year option as int
Fix return value issue of DVD#rip if block is given
Bump up version to 1.0.4
Merge pull request #11 from katsuma/features/add_year_option

Add year option and converting progress bar