1.3.4.
    
    Don't rely on retriggering printers; enumerate them from systemd
    instead.
    Don't complain about missing/invalid device ID for devices we've
    already handled.
    Removed unused Printer Groups feature.
    Don't show "No printers configured" page if the printers are
    filtered in any way.
    URL-quote URIs when using "Find Network Printer" (Ubuntu #808137).
    Downloadable drivers: don't display printers for which there are
    no drivers (bug #668154).
    Kerberos support for the SMB 'Verify' button (requires new enough
    pycups).
    Removed IPP/HTTP device screen in favour of "Enter URI"
    (bug #685091).
    Converted ComboBoxEntry widgets to Entry+EntryCompletion in
    NewPrinterWindow.ui.
    Robustness in ppdsloader in the face of errors (Ubuntu #766818).
    Changed Make/Model/State labels into GtkEntry widgets so contents
    are always fully selectable (bug #719217).
    Convert iters to paths before comparing (bug #717062, Ubuntu #791690,
    trac #221).
    Set translation domain in D-Bus service (Ubuntu #783967).
    Ensure consistency in jobviewer if add_job fails (bug #693055,
    bug #632551).
    Avoid PostScript for HP LaserJet 2100 Series (bug #710231).
    Raised priority for SpliX driver (Ubuntu bug #793741).
    Updated Free Software Foundation (FSF) address.
    Adjusted test code in asyncpk1.py so it doesn't look like a
    tempfile vulnerability.