Fix grammer,etc. in feature description.
Use same format in Rule description.
Do not do 'gem install bundler' in cruise.rb
Use Trema::DefaultLogger (refs #233)
Make finalize_trema public to avoid using start_trema_up/down.
Merge pull request #267 from y-higuchi/fix_read_pid_check

Fix read_pid to support -n, --name option.
Make spec/feature run faster.