Cec

Hello,
This patch try to activate plugged CEC devices before play somthing.

diff is:
```diff
@@ -75,6 +75,11 @@ def _getJobs(self, number):
def _play(self, item, volume):
+ try:
+   xbmc.executebuiltin('CECActivateSource')
+ except:
+    pass
+
  xbmc.executebuiltin('SetVolume(%s)' % volume)
  xbmc.Player().play(item)
```