Chromeless/FlowPlayer/OSMF: retrieve video width and height from HLSEvent.FRAGMENT_PLAYING
related to https://github.com/mangui/flashls/issues/59
allow progressive buffering for first fragment in case HLSSettings.startFromLevel=-1 and there is only one level
related to https://github.com/mangui/flashls/issues/77
ChromelessPlayer.as: reduce onPosition() ExternalInterface call overhead by transmitting only one args
also only update min/mwax/low buffer len upon player starting/value modification to reduce call overhead
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update swf/swc
flashlsFlowPlayer.swf: fix slider not being updated after seek
related to #75
Merge pull request #7 from mangui/master

Update flashls with mangui's master