convert crummy plugin to proper gem

Change-Id: I611b9fbc72d65696ee0c7f4889515eec56d3c463
Reviewed-on: https://gerrit.instructure.com/29451
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Stephan Hagemann <stephan@pivotallabs.com>
Product-Review: Stephan Hagemann <stephan@pivotallabs.com>
QA-Review: Stephan Hagemann <stephan@pivotallabs.com>
Tested-by: Stephan Hagemann <stephan@pivotallabs.com>