Update Capistrano dependency to v3.1.0
Raise an exception instead of using exit command when local war file or context.xml template file does not exist.
The example for 'native' has changed because Capistrano do not allow load_imports in Capistrano class since they update to v3.1.0
v1.1.0
Merge pull request #3 from sunggun-yu/v1.1.0

V1.1.0