Ubuntu etc files

- Point RedHat README to website
- Add ubuntu upstart, logrotate configs

etc/ubuntu-12/README

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+Please see the Ubuntu installation guide on our website:
+
+http://jhillyerd.github.com/inbucket/installation/ubuntu.html

etc/ubuntu-12/inbucket-upstart.conf

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+# inbucket - disposable email service
+#
+# Inbucket is an SMTP server with a web interface for testing application
+# functionality
+
+description "inbucket - disposable email service"
+author      "http://jhillyerd.github.com/inbucket"
+
+start on (local-filesystems and net-device-up IFACE!=lo)
+stop on runlevel [!2345]
+
+env program=/opt/inbucket/inbucket
+env config=/etc/opt/inbucket.conf
+env logfile=/var/log/inbucket.log
+env runas=inbucket
+
+# Give SMTP connections time to drain
+kill timeout 20
+
+pre-start script
+  [ -x $program ]
+  [ -r $config ]
+  touch $logfile
+  chown $runas: $logfile
+  # Allow bind to ports under 1024
+  setcap 'cap_net_bind_service=+ep' $program
+end script
+
+exec start-stop-daemon --start --chuid $runas --exec $program -- -logfile $logfile $config

etc/ubuntu-12/inbucket.logrotate

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+/var/log/inbucket.log {
+  missingok
+  notifempty
+  create 0644 inbucket inbucket
+  postrotate
+    [ -x /sbin/reload ] && /sbin/reload inbucket >/dev/null 2>&1 || true
+  endscript
+}