WebKitGTK+ 2.5.1 released!

This is the first development release leading toward 2.6 series.

WebKit1 API has been removed.
Binary version bump to make WebKit1 and WebKit2 parallel installable.
Switch to CMake build system.
The WebKitWebView::create signal now receives a WebKitNavigationAction with information about the navigation action that triggered the signal.
WebKitWebViewGroup has been removed from the API and WebKitUserContentManager has been added to handle user stylesheets.
WebKitCertificateInfo has also been removed. WebKitWebView::load-failed-with-tls-errors signal now receives a GTlsCertificate and GTlsCertificateFlags, and webkit_web_context_allow_tls_certificate_for_host() receives a GTlsCertificate.
The view mode API (webkit_web_view_set_view_mode() and webkit_web_view_get_view_mode()) has been removed, since WebCore doesn’t support view source mode anymore.
The DOM bindings API has been split into stable and unstable parts, and all deprecated methods have been removed. The stable part will keep API/ABI backwards compatibility, while the unstable part might change.
Add API to load arbitrary data optionally giving the encoding and MIME Type.
Add support for plugins using GTK+ 3.
Add HighDPI support for non-accelerated compositing contents.
Use a different user agent string depending on the site.

Thanks to all the contributors who made possible this release.