[gtkmm] (11 commits) Non-fast-forward update to branch wip/dboles/builder-nicer-4

[Daniel Boles <dboles src gnome org>]

The branch 'wip/dboles/builder-nicer-4' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  940f06a... Builder: Add returning vers of get_widget|_derived
  cb88060... tests|gtk-demo: Use new Builder.get_widget*() vers
  b43773f... Builder: Add get_object<Derived>(name) overloads

Commits added to the branch:

  ca99aaf... Gdk::RGBA: Delegate constructors instead of repeat (*)
  fa75809... Gdk::RGBA: Add constructor taking doubles r,g,b,a (*)
  7d6d482... Merge branch 'wip/dboles/builder-retval-4' into 'master' (*)
  02bc69b... RGBA.set_hsv(): Properly interpret hue 360° as red (*)
  cbc6340... Merge branch 'wip/dboles/rgba-set_hsv-360-4' into 'master' (*)
  c115a85... Merge branch 'wip/dboles/rgba-construct-doubles-4' into 'ma (*)
  37d4ab7... Gdk::RGBA: Add fairly simple test of our additions (*)
  d2638e3... Builder: Add returning vers of get_widget|_derived
  29cdc80... tests|gtk-demo: Use new Builder.get_widget*() vers
  36372b7... Builder: Add get_object<Derived>(name) overloads
  1910093... tests/builder: Test get_object() overloads coexist

(*) This commit already existed in another branch; no separate mail sent