update NEWS for 0.4.0

Change-Id: I90327d5169b1dba8245c427a03064d562aa26cc9
update AUTHORS & .mailmap

Change-Id: I5419731cd7ac6a06e42ef12433286a97e8e13bb4
bump version to 0.4.0

libwebp{,decoder} - 0.4.0
libwebp libtool - 5.0.0
libwebpdecoder libtool - 1.0.0

mux/demux - 0.2.0
libtool - 1.0.0

Change-Id: Idbd067f95a6af2f0057d6a63ab43176fcdbb767d
Merge "bump version to 0.4.0" into 0.4.0
update Changelog

Change-Id: I60525ce8dedf0843578c1881f6e140098e01211c
makefile.unix: clean up libgif2webp_util.a

Change-Id: Iee8650ce91f65f2db568926773d44441633459f3
cwebp: fix metadata output w/lossy+alpha

Change-Id: Ic96da6523fc73a7b67c68ef8a4c9d12081f8a535
gif2webp: don't use C99 %zu

this would require a PRIuS or similar macro for proper platform
compatibility (Visual Studio for instance would be variants of %lu)

Change-Id: I2b9fcb1639db024775fb47dbcf79a2240f3d98f2
Merge "gif2webp: don't use C99 %zu" into 0.4.0
update NEWS description with new general features

Change-Id: I22be12d843e84f80965dc5f2cb16ba2475ce16ad
update ChangeLog

Change-Id: If51472e72adaec0a198a8b09becb8be192153ca8
Merge tag 'v0.4.0'

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.

* tag 'v0.4.0':
  update ChangeLog
  update NEWS description with new general features
  gif2webp: don't use C99 %zu
  cwebp: fix metadata output w/lossy+alpha
  makefile.unix: clean up libgif2webp_util.a
  update Changelog
  bump version to 0.4.0
  update AUTHORS & .mailmap
  update NEWS for 0.4.0

Change-Id: I6df1b512fe0b697192f1f9b29431cd59aa6063d1
Merge "Merge tag 'v0.4.0'"
add man/vwebp.1

Change-Id: I3257fdeb7d48af99946f751e3e2cd07660117255
Merge "add man/vwebp.1"
add a decoding option to flip image vertically

New API options: WebPDecoderOptions.flip and 'dwebp -flip ...'

it uses negative stride trick.

Also changed the decoder code to support user-supplied
buffers with negative stride, independently of the
WebPDecoderOptions.flip value.

Change-Id: I4dc0d06f0c87e51a3f3428be4fee2d6b5ad76053
make WebPCleanupTransparentArea work with argb picture

the -alpha_cleanup flag was ineffective since we switched cwebp
to using ARGB input always.

Original idea by David Eckel (dvdckl at gmail dot com)

Change-Id: I0917a8b91ce15a43199728ff4ee2a163be443bab