GStreamerSharp: remove NIE about subtitles
GStreamerSharp: port Visualization to 1.0

Porting the caps, since I see this sentence in the porting guide[1]:
"Video and audio caps were simplified. audio/x-raw-int and
audio/x-raw-float are now all under the audio/x-raw media type.
Similarly, video/x-raw-rgb and video/x-raw-yuv are now video/x-raw."

[1] http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-porting-1.0.html