Add a simple task for line_change:app_name
Add faraday and faraday_middleware
Add Connection class
Add Deploy class
Use the actual Deploy class in LineChange.deploy method

Also, LineChange::Deploy doesn't require api_key, so let's just remove it
from LineChange.deploy method.
We no longer have to use api_key when creating tasks
Add description about the rake tasks defined by LineChange
Stub a request in before, not in let
Handle error HTTP status and raise an exception if not successful status
No need to use a block, just inline everything
Register ResponseHnadler to faraday middleware