Add GtkRevealer to the Gtk+ catalog
Finished support for GtkRevealer.
Ignore reveal-child property and added a proxy property to test it.
Added icons.
Fixed sporadic behaviour of spin buttons.

There may be more issues, but now selecting the entry text and inserting
new text will not have any 0 appended.

This regression (fixed by this patch) was introduced by
commit 84990bcaec39109be3c53b1a13ba31ca5d865970
Removed reveal-child-test-proxy property. We always show up the widget in the workspace.
Add GtkListBox support

https://bugzilla.gnome.org/show_bug.cgi?id=702296
GtkListBox support: Added action to add list box rows to a list box.
Added add-child-verify function to GtkScrolledWindow which is the only place we want to check if we can add a child or not.
Stop using glade_util_check_and_warn_scrollable() everywhere but in GtkScrolledWindow add-child-verify function.
Updated POTFILES.in
GtkListBox: Simplify code by using new GTK+ API

Instead of fiddling around with gobject_get_data/set_data and sorting, use the
new gtk_list_box_insert() and gtk_list_box_row_get_index() to put the rows in
the correct position.
build: Bump the required GTK+ version for the new listbox API
Fixed some composite template classes

... to properly mention if children are accessible as "internal" or not.
Updated Lithuanian translation
catalog: add missing attributes to the DTD

Most projects shipping external catalogs check validity with the
DTD during make check, so it's important that most supported
features are advertised.

https://bugzilla.gnome.org/show_bug.cgi?id=700962
Updated Slovenian translation
Updated Spanish translation
Fixed copyright dates
Replaced glade_design_layout_find_inside_container() with new private API
_glade_design_layout_get_child_at_position()
Added GtkOverlay support
Fixed rendering issues now that we support GtkOverlay and overlay children can be outside of its parent allocation.
Drag&Drop clean up.

Added private _GladeDrag interface. (only used internaly in gladeui)

Implemented _GladeDrag in GladePlaceholder GladeWidget GladeDesignView and GladeDesignLayout

Added drag-dest property to GladeWidget to enable/disable drag support
(used in GtkFixed GtkLayout and GtkOverlay containers)

Made GladeInspector a drag source by implementing GtkTreeDragSource interface in GladeProject