Remove unused options / Refine format
Align to http://devtesting.jp/tddbc/?TDDBC%E4%BB%99%E5%8F%B002%2F%E8%AA%B2%E9%A1%8C%E7%94%A8%E8%AA%9E%E9%9B%86
Refactoring spec
Refine drinks method
Refine spec
Rename method
Refactoring
Refine API
Refactoring