libwebp 0.4.0

- 12/19/13: version 0.4.0
  * improved gif2webp tool
  * numerous fixes, compression improvement and speed-up
  * dither option added to decoder (dwebp -dither 50 ...)
  * improved multi-threaded modes (-mt option)
  * improved filtering strength determination
  * New function: WebPMuxGetCanvasSize
  * BMP and TIFF format output added to 'dwebp'
  * Significant memory reduction for decoding lossy images with alpha.
  * Intertwined decoding of RGB and alpha for a shorter
    time-to-first-decoded-pixel.
  * WebPIterator has a new member 'has_alpha' denoting whether the frame
    contains transparency.
  * Container spec amended with new 'blending method' for animation.
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