Building off of issue#22 filed on GitHub, it would be helpful if there was a way to access the GitHub comment body that triggered the build.  This is particularly helpful in the case where a single pipeline is building/testing many different pieces of a project and you would like to control through PR comments, the rebuilding of any specific piece.

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Ideally this would place the comment body in an environment variable accessible from within the build:

env.GITHUB_PR_COMMENT

But would be equally helpful to be able to access it through the trigger cause object:

currentBuild.getRawBuild().causes[0].getCommentBody()