Print output of set pipeline.
Print output of set pipeline.

Fix #37.
Fix #45.

Print the output of the set-pipeline command to improve
visibility of the change performed by the resource.

Signed-off-by: Alessandro Degano <55cacd5b504daf5c7cafa0b6b8e4521b86a643c4@pix4d.com>

robdimsdale/concourse-pipeline-resource,robdimsdale/concourse-pipeline-resource