Add a new CefGetGeolocation function for retrieving geolocation information via

an API callback ( issue #764 ).

- Expose tracing functionality via new cef_trace.h and cef_trace_event.h headers

( issue #711 ).

Add CefV8ContextHandler::OnUncaughtException callback ( issue #736 ).

Eliminate use of scoped directories ( issue #670 ).

- related to cefpython Issue 2 - app error on exit

Create a temporary cache_path directory if none is specified ( issue #735 ).

Add CefZoomHandler interface to support custom zoom handling ( issue #733 ).