Cleanup prompt component, created dummy chrome listener component (placeholder for most of WebBrowserChrome functionality)
Created example of child component which listen for Title dom window changes
Removed internal json-c module (link with external)
Fixed crash in Sync message (old qt example)
fixed test
Relax gstreamer version requirements.

Use playbin2 "notify::source" signal instead of "signal::source-setup",
which is not available in gstreamer versions prior to 0.10.33.

Signed-off-by: Ivaylo Dimitrov <freemangordon@abv.bg>