reuse Disk resource if possible.
show size of archives.
update default disk archive.
develop for vagrant 1.5.3.
remove spec.add_development_dependency
ssh_info[:private_key_path] can be an array.
add synopsis of sakura-list-id command.
HandleBoxUrl was renamed to HandleBox.

(this commit may break compatibility with Vagrant<1.5...)
version 0.0.5.