Replace opacity key to alpha value in color key.
Fix expanded panels and size allocation
Fix RGBA issues for GTK3
Merge pull request #209 from rilian-la-te/fix_rgba_all

Fix rgba all
Merge pull request #211 from rilian-la-te/remove_opacity_key_gtk3

Remove opacity key gtk3
Merge pull request #212 from rilian-la-te/fix_expand

Fix expand
Restore way to close windows with middle click

It was forgot during transition to libwnck
Closes https://github.com/mate-desktop/mate-panel/issues/191
Use MateColorButton in panel properties dialog
Bump required mate-desktop version to 1.9.2

Needed for the new MateColorSelecionDialog.
Bump required mate-desktop version to 1.9.1
Merge pull request #26 from mate-desktop/master

Merge from master