Added (Linux) file monitor configuration to Fabric script.

Also improved `create_user` to allow overwriting some settings.

data/etc/default/rattail

@@ -0,0 +1,4 @@
+# The following settings affect all Rattail daemons.
+
+USER=rattail
+GROUP=rattail

data/etc/init.d/rattail-filemon_tmpl

@@ -0,0 +1,19 @@
+#! /bin/sh
+### BEGIN INIT INFO
+# Provides:          %(name)s
+# Required-Start:    $remote_fs $syslog
+# Required-Stop:     $remote_fs $syslog
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: %(desc)s
+# Description:       Manages the %(desc)s daemon.
+### END INIT INFO
+
+DESC="%(desc)s"
+NAME=%(name)s
+
+PYTHON=%(envdir)s/bin/python
+RATTAIL=%(envdir)s/bin/rattail
+RATTAIL_ARGS="--config=%(envdir)s/app/filemon.ini"
+
+. /var/lib/rattail/init.d/filemon