[opus] Opus 1.1.1 is out!

[Jean-Marc Valin]

Hi everyone,

After much waiting, Opus 1.1.1 is finally here. The main changes are:
- x86 SSE, SSE2 and SSE4.1 optimizations contributed by Cisco,
- MIPS optimizations contributed by Imagination Technologies,
- ARM Neon optimizations contributed by Linaro and ARM,
- many architecture-independent optimizations,
- memory footprint reductions, and
- several minor bug fixes.

The quality of the encoder should be mostly unchanged compare to version
1.1. The code is available from the downloads page at:
http://www.opus-codec.org/downloads/

Please report any issue you find in this release.

	Jean-Marc