wget http://github.com/mindpin/project_build_tools/raw/master/project_build_tools-0.0.1.gem
gem install project_build_tools-0.0.1.gem
# 生成 sinatra 工程
# 运行这个命令会在当前目录下创建 $project_name 目录
pbtools sinatra $project_name
# 启动 sinatra 工程
cd $project_name
bundle
bundle exec rackup