Add resume after playback started from non zero starting point

Per this thread:
http://forum.xbmc.org/showthread.php?tid=183743&highlight=unpause+jump+back

I have added this.

I find I needed an xbmc.sleep(100) in there to make sure the currentTime call returned the currenttime - without it seems to still be at the 0 point when this is executed.  I suppose that's an xbmc.bug - this makes this work, though.

Hopefully string/logging etc is ok?