SAK-25523 first commit to use prop instead of attr (jQuery 1.9+) and other minor fixes


git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@133077 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-25523 modify the audio display to display waveform based on average volume


git-svn-id: https://source.sakaiproject.org/svn/reference/trunk@133078 66ffb92e-73f9-0310-93c1-f5514f145a0a