Fix 347
Hide volume slider and mute toggle when the current tech doesn't support adjusting video volume. Added controls specific test cases. Volume-related controls retest whether to display themselves whenever `loadstart` fires.
Remove unused variable
Get rid of a variable that was copy-pasted along from a previous incarnation of this fix.
Reformat `var` statements
Declare them in a single line at the top of the function and initialize them later.
Block defineSetter test for older IE
__defineSetter__ doesn't work on some versions of IE, so just ignore the volume/mute toggle tests when run on those browsers.
Remove phantom UA check
The volume controls and mute toggle are guarding against not having a tech present, so it's no longer necessary to mock the tech for all command-line tests. Individual tests continue to do so using PlayerTest.makePlayer.
Merge pull request #354 from dmlap/issue347

Fix Issue #347