Updating the video.js that we use to avoid an XSS attack. Yikes! ;\

This commit sponsored by Daniel Valentine.  Thank you!

extlib/video-js/demo.captions.vtt

@@ -0,0 +1,41 @@
+WEBVTT
+
+00:00.700 --> 00:04.110
+Captions describe all relevant audio for the hearing impaired.
+[ Heroic music playing for a seagull ]
+
+00:04.500 --> 00:05.000
+[ Splash!!! ]
+
+00:05.100 --> 00:06.000
+[ Sploosh!!! ]
+
+00:08.000 --> 00:09.225
+[ Splash...splash...splash splash splash ]
+
+00:10.525 --> 00:11.255
+[ Splash, Sploosh again ]
+
+00:13.500 --> 00:14.984
+Dolphin: eeeEEEEEeeee!
+
+00:14.984 --> 00:16.984
+Dolphin: Squawk! eeeEEE?
+
+00:25.000 --> 00:28.284
+[ A whole ton of splashes ]
+
+00:29.500 --> 00:31.000
+Mine. Mine. Mine.
+
+00:34.300 --> 00:36.000
+Shark: Chomp
+
+00:36.800 --> 00:37.900
+Shark: CHOMP!!!
+
+00:37.861 --> 00:41.193
+EEEEEEOOOOOOOOOOWHALENOISE
+
+00:42.593 --> 00:45.611
+[ BIG SPLASH ]