Closes #6209 Precise support for GIR WebKitGTK binding. Rolls back to deprecated context menu in composer for compatibility with WebKitGTK 1.8
Squashed commit of the following:

commit 6e066374da45dd602ee1ca3c9bc5f77b9411b6f4
Author: Eric Gregory <eric@yorba.org>
Date:   Tue Jan 15 11:36:32 2013 -0800

    Closes #6209 Precise support for GIR WebKitGTK binding. Rolls back to deprecated context menu in composer for compatibility with WebKitGTK 1.8