libwebp-0.5.0

- 12/17/2015: version 0.5.0
  * miscellaneous bug & build fixes (issues #234, #258, #274, #275, #278)
  * encoder & decoder speed-ups on x86/ARM/MIPS for lossy & lossless
    - note! YUV->RGB conversion was sped-up, but the results will be slightly
      different from previous releases
  * various lossless encoder improvements
  * gif2webp improvements, -min_size option added
  * tools fully support input from stdin and output to stdout (issue #168)
  * New WebPAnimEncoder API for creating animations
  * New WebPAnimDecoder API for decoding animations
  * other API changes:
    - libwebp:
      WebPPictureSmartARGBToYUVA() (-pre 4 in cwebp)
      WebPConfig::exact (-exact in cwebp; -alpha_cleanup is now the default)
      WebPConfig::near_lossless (-near_lossless in cwebp)
      WebPFree() (free'ing webp allocated memory in other languages)
      WebPConfigLosslessPreset()
      WebPMemoryWriterClear()
    - libwebpdemux: removed experimental fragment related fields and functions
    - libwebpmux: WebPMuxSetCanvasSize()
  * new libwebpextras library with some uncommon import functions:
    WebPImportGray/WebPImportRGB565/WebPImportRGB4444
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