CEF Python 53.0 Beta (Python 2.7 and Linux only)

Note on examples:

• Only pygtk_.py and kivy_.py examples were tested and do work fine. Other examples provided with the installer do have issues.
• For PyQt4/PySide examples that do work fine with this release see Issue 234 and this comment

Changes in this Release:

• Update to Chrome/53.0.2785.89
• Add support for drag & drop in OSR Kivy (kivy_.py example)
• New methods in the Browser object: DragTargetDragEnter, DragTargetDragOver, DragTargetDragLeave, DragTargetDrop, DragSourceEndedAt, DragSourceSystemDragEnded.
• New object: DragData and its methods
• New callbacks in RenderHandler: StartDragging, UpdateDragCursor, GetScreenRect

See api/ docs for the description of new functions.