Add license file and mention in the docs for GPLv2+.

Change-Id: I4fa625452228eda7aef97b3e4fb09d21bbdf6470
Reviewed-by: Andras Becsi <andras.becsi@theqtcompany.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

LICENSE.GPLv2

+            GNU GENERAL PUBLIC LICENSE
+
+ The Qt Toolkit is Copyright (C) 2015 The Qt Company Ltd.
+ Contact: http://www.qt.io/licensing/
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+ You may use, distribute and copy the Qt GUI Toolkit under the terms of
+ GNU General Public License version 2, which is displayed below.
+
+-------------------------------------------------------------------------
+
+            GNU GENERAL PUBLIC LICENSE
+                Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
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+END OF TERMS AND CONDITIONS

src/webenginewidgets/doc/src/qtwebenginewidgets.qdoc

@@ -131,7 +131,7 @@
     GNU Library General Public License (LGPLv2).
 
     Developers using the Open Source Edition can choose to redistribute
-    the module under the GNU LGPLv3.
+    the module under the GNU LGPLv3 or GPLv2 and up.
 
     \legalese