Merge pull request #55 from zdobersek/webkitgtk

Bump the WebKitGTK+ version.
qtbrowser: bump to version 1.0.7
gstreamer1: bump to version 1.3.2
qt5webkit: bump revision

299481b Video rendering improvement.
e2706b2 Small rendering improvements.
rpi: update defconfigs to support wk2
webkitgtk: fix dependencies for glesv2 and egl
Bump Wayland and Weston to 1.5.0.
Bump libglib2 to 2.40.0.
Bump libgtk3 to 3.12.2.