minor comment fixes and a compiler warning from bad cut and paste
add description methods to media and mvid frame decoder classes, check for gnu define and not clang for workaround code that should only be used with gcc 4.2, change mapped memory check so that breakpoint can be set on a line for the fail case
hold media object in local variable instead of class property, make the function easier to debug since one no longer needs to step through the getter on each call
update tests to avoid running huge memory test on iphone device, fixup superwalk gif filename
change media logic so that stop notification is not delivered when media was just initialized and then played, this could cause some series problems if the user starts to play one animation from the stop notification of another, add test cases for this stop notification delivery, optimize use of media property with local vars