Fix RIFF chunk length

Note 4 bytes of RIFF Format is a part of RIFF chunk length since is not padding of RIFF container
Try generate a WAV file from Audacity / Check Microsoft & IBM's RIFF Specification
Merge pull request #50 from vizv/patch-1

Fix RIFF chunk length
Remove note RE Google Canary, see http://caniuse.com/#feat=stream
Merge pull request #72 from fulldecent/patch-1

Remove note RE Google Canary, see http://caniuse.com/#feat=stream