LP#1306044 Debian Jessie Makefile.install target

* Removes Perl Net::Jabber as a dependency.  There is no Jessie package
  for this and OpenSRF hasn't used it in a long time.

* Leaving Debian Squeeze in place for now

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
LP#1306044 Removing deprecated jabber register script

This script is no longer user, since ejabberdctrl is used instead.
What's more, this script uses a Perl package (libnet-jabber-perl) which
is no longer available in Debian (Jessie).

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>