~kklimonda/ubuntu/natty/glibmm2.4/update

* New Upstream release: (LP: #399018):
  - 2.21.2:
    - Add OptionGroup::add_entry(.., double&)
    - Remove stray semicolons
    - Fix build with glib from master
    - wrap a couple added GDrive methods
    - Wrap g_drive_eject_with_operation() and related functions
    - implement GDrive::stop-button signal
    - implement Gio::InetAddress::get_native_size()
    - Implement Gio::Mount::mount/eject_with_operation()
    - implement Gio::Volume::eject_with_operation()
    - fix accidental bug in Gio::Drive::eject() that the compiler warned me about
    - implement Gio::VolumeMonitor::drive-stop-button
  - 2.21.1 (unstable):
    Glib:
     - Date: Constructor: Check for invalid dates.
     - Added Glib::ValueArray, for use in gstreamermm.
     - Added Glib::file_set_contents().
     - gmmproc:
       - Avoid problems with spaces in _DEFS() calls.
       - Improve guessing of the *_get_type() function names from enum names.
    Gio:
     - Cancellable: Added connect() and disconnect().
     - Added FileIOStream.
     - Added InetAddress.
     - Added Initable.
     - Added IOStream.
     - Added NetworkAddress.
     - Added NetworkService.
     - Added Resolver
     - Added Socket.
     - Added SocketAddress.
     - Added SocketConnectable.
     - Added SrvTarget.
     - File::load_contents() Added overload without the etag_out parameter.
* debian/control{.in}:
  - bump build-dep on libglib2.0-dev to >= 2.21.1
* debian/rules
  - bump SHVER-value to 2.21.2
* debian/watch
  - also look for unstable versions