[gnome-sdk-images] Update to latest unstable webkit and add MiniBrowser to sdk

[Alexander Larsson <alexl src gnome org>]

commit 618a754226c72af54260f84202c133cbb2ce2913
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Feb 21 11:21:26 2017 +0100

    Update to latest unstable webkit and add MiniBrowser to sdk
    
    https://github.com/flatpak/flatpak/issues/581

 org.gnome.Sdk.json.in |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 148f33b..42169d1 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -729,6 +729,7 @@
         },
         {
             "name": "webkitgtk4",
+            "cleanup-platform": [ "/libexec/webkit2gtk-4.0/MiniBrowser" ],
             "cmake": true,
             "build-options" : {
                 "cflags": "-O2 -g1",
@@ -761,13 +762,14 @@
                "-DBUILD_SHARED_LIBS:BOOL=ON",
                "-DENABLE_GTKDOC=OFF",
                "-DENABLE_VIDEO=ON",
-               "-DENABLE_WEB_AUDIO=ON"
+               "-DENABLE_WEB_AUDIO=ON",
+                "-DENABLE_MINIBROWSER=ON"
            ],
             "sources": [
                 {
                     "type": "archive",
-                    "url": "https://www.webkitgtk.org/releases/webkitgtk-2.15.4.tar.xz";,
-                    "sha256": "b5548a8a0a9e3133bd5a27f4fd0307f58871409134c308a9f09db8baa83a8bf4"
+                    "url": "https://www.webkitgtk.org/releases/webkitgtk-2.15.90.tar.xz";,
+                    "sha256": "d9c13cf5b1db9e398d9d6a55e1b272a85e86bd00650cc068a9744864f48996ba"
                 },
                 {
                     "type": "patch",