Implement region controll
Add subcommand 'sync' (check config)
Implement Synchronizer#sync!
Implement get bucket.
moving progress message view
Modified sync command, set default value.
Implement sync logic. (TODO: directory)
Remove method.
Rename methods
Implement sync logic for recursive upload.
Merge branch 'feature/sync_command' into develop
Modified gemspec
Update README.md
Bump up version to '0.7.0'
Merge branch 'release/v0.7.0' into develop