Bug 994292 - Fix race between 'playing' and wakelock events. r=baku

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extra : rebase_source : 4a08b9b8bfcc026d05e6862dc08bad350033aa46
Bug 1027350 - Allow loopback addresses for ICE. r=bwc

--HG--
extra : rebase_source : 525e2d8455beff596c1ae13b4a8c4d062533a0df
Bug 1027350 - Allow loopback addresses for ICE in signaling unit test. r=bwc

--HG--
extra : rebase_source : 3e73f02aa1c889f331c8326f17bb5e245204b780
Bug 1072340 - Clean up PNG codecs in image/encoders,decoders. r=jmuizelaar

--HG--
extra : rebase_source : e8789fd34910ae510483034a769e77e70e644198