- 7/13/12: version 0.1.99
  * Alpha channel encode/decode support.
  * Lossless encoder/decoder.
  Incompatible changes:
    * The encode ABI has been modified to support alpha encoding.
    * Deprecated function WebPINew() has been removed.
    * Decode function signatures have changed to consistently use size_t over
      int/uint32_t.

- 9/19/11: version 0.1.3
  * Advanced decoding APIs.
  * On-the-fly cropping and rescaling of images.
  * SSE2 instructions for decoding performance optimizations on x86 based platforms.
  * Support Multi-threaded decoding.
  * 40% improvement in Decoding performance.
  * Add support for RGB565, RGBA4444 & ARGB image colorspace.
  * Better handling of large picture encoding.

- 3/25/11: version 0.1.2
  * Incremental decoding: picture can be decoded byte-by-byte if needs be.
  * lot of bug-fixes, consolidation and stabilization

- 2/23/11: initial release of version 0.1, with the new encoder
- 9/30/10: initial release version with only the lightweight decoder