rolling Opus 1.1

This version contains optimizations needed by WebRTC.

More information about version 1.1 can be found here http://people.xiph.org/~xiphmont/demo/opus/demo3.shtml.

Platform specific optimizations are to be added in a following CL.

TEST=passes all trybots

BUG=
R=kjellander@webrtc.org, tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/7689004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5449 4adac7df-926f-26a2-2b94-8c16560cd09d
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