Add generic Luigi install logic

at least try to do what we can to reduce boilerplate

rattail_fabric2/deploy/luigi/cron-overnight.sh.mako

@@ -0,0 +1,21 @@
+#!/bin/sh -e
+<%text>############################################################</%text>
+#
+# overnight automation (${automation}) via cron
+#
+<%text>############################################################</%text>
+
+
+if [ "$1" = "--verbose" ]; then
+    VERBOSE='--verbose'
+    PROGRESS='--progress'
+else
+    VERBOSE=
+    PROGRESS=
+fi
+
+cd ${envroot}
+
+RATTAIL="bin/rattail --config=app/cron.conf $PROGRESS"
+
+$RATTAIL run-n-mail --no-versioning --skip-if-empty --subject 'Overnight automation: ${automation}' ${envroot}/app/overnight_${automation.lower()}.sh