add workaround for loading `capistrano-rbenv` earlier than `capistrano/ext/multistage`. (refs #7)
Merge branch 'issue7' into develop
add rbenv.available_versions
setup Vagrant for tests
generate path from the path of __FILE__, not from process's cwd
add Gemfile for tests
update default ruby version
update :rbenv_ruby_versions before building since it may be referenced.
1.0.0rc1