Show currently selected plot in EPG timeline

The EPG timeline shows the plot for the currently airing show...it doesn't update when moving around the timeline. This commit allows the plot/genre/time to update when moving around the timeline.

See http://forum.xbmc.org/showthread.php?tid=192623&pid=1686409#pid1686409
Merge pull request #610 from bryanbrazil2/master

Show currently selected plot in EPG timeline