Add a formula for moco

Moco is an easy setup stub framework.
More information can found in [https://github.com/dreamhead/moco](https://github.com/dreamhead/moco).

Integration, especially based on HTTP protocol, e.g. web service, REST etc, is wildly used in most of our development.
Moco can do it by provider a quick and fake server to help development.
Update moco.rb

Add test call `--help`

Sadly, moco don't have support for `--version`.... so use `--help` to test.
Add more detail test for moco

It's a simple example given by moco homepage.
Start a moco wich response 'Hello, Moco' and use http to get the response and then check them.
moco: add runner bottle.