[vala] Created tag 0.20.0

[Jürg Billeter <juergbi src gnome org>]

The signed tag '0.20.0' was created.

Tagger: Jürg Billeter <j bitron ch>
Date: Tue Mar 26 21:13:26 2013 +0100

    0.20.0

Changes since the last tag '0.19.0':

Evan Nemerson (3):
      girparser: support renaming fields in metadata
      bindings: update GIR-based bindings
      glib-2.0, gtk+-3.0: make parameter string for goption nullable

Jesse van den Kieboom (1):
      Updated gtk+-3.0 to lastest master

Jürg Billeter (1):
      Release 0.20.0

Luca Bruno (4):
      gtk+-2.0, gtk+-3.0: Fix IconView.get_visible_range
      gtk+-2.0, gtk+-3.0: Fix TreePath.to_string and TreeView.get_visible_range
      codegen: Destroy value of "as" cast in case the result is null
      Support non-null cast for enum values

Paolo Borelli (1):
      gtk+-3.0: make TreeView::set_search_entry nullable