Add default configuration file for droned.

Also mark configuration file as conffiles.

Makefile

@@ -48,6 +48,7 @@ test:
 
 install:
 	cp deb/drone/etc/init/drone.conf /etc/init/drone.conf
+	test -f /etc/default/drone || cp deb/drone/etc/default/drone /etc/default/drone
 	cd bin && install -t /usr/local/bin drone
 	cd bin && install -t /usr/local/bin droned
 	mkdir -p /var/lib/drone

deb/drone/DEBIAN/conffiles

@@ -0,0 +1,2 @@
+/etc/init/drone.conf
+/etc/default/drone

deb/drone/etc/default/drone

@@ -0,0 +1,10 @@
+# Upstart configuration file for droned.
+
+# Command line options:
+#
+#   -datasource="drone.sqlite":
+#   -driver="sqlite3":
+#   -path="":
+#   -port=":8080":
+#         
+#DRONED_OPTS="--port=:80"

deb/drone/etc/init/drone.conf

@@ -4,5 +4,9 @@ chdir /var/lib/drone
 console log
 
 script
-    droned --port=":80"
+    DRONED_OPTS="--port=:80"
+    if [ -f /etc/default/$UPSTART_JOB ]; then
+        . /etc/default/$UPSTART_JOB
+    fi
+    droned $DRONED_OPTS
 end script