Add support for Jenkins Pipelines to Faux Pas plugin

[Kent Sutherland]

Jenkins 2.0 and beyond are pushing the concept of pipelines pretty hard. Unfortunately this requires updating plugins in order to work with the new pipeline job type.

It'd be great to be able to use the Faux Pas plugin as part of a pipeline job.

Info about adapting plugins for pipelines here: https://github.com/jenkinsci/pipeline-plugin/blob/master/DEVGUIDE.md