Use more specific ignore rules

git-svn-id: https://svn.apache.org/repos/asf/buildr/trunk@1470073 13f79535-47bb-0310-9956-ffa450edef68
Ignore setup scripts

git-svn-id: https://svn.apache.org/repos/asf/buildr/trunk@1470074 13f79535-47bb-0310-9956-ffa450edef68