Merge pull request #136 from infirit/master

Fix build failure
Remove distro folder.
Merge pull request #137 from flexiondotorg/master

Remove distro folder.
Add return to gboolean function

Closes #134
https://github.com/mate-desktop/mate-panel/issues/134
Fix not expanded applets list in GTK3 addto dialog
wncklet: Fit window list size with GTK3
GTK3: Fix compile warning by using gdk_error_trap_pop_ignored()
Merge pull request #142 from NiceandGently/master

GTK3: Fix compile warning by using gdk_error_trap_pop_ignored()