Add WebP support for image compression

[GoogleCodeExporter]

This should be straight forward. If the Browser is Chrome > 9 or Opera > 10.10 
images should be compressed with WebP. I wold do it and submit a patch in this 
issue when i am done.

Original issue reported on code.google.com by timo.witte on 23 May 2011 at 12:27

[GoogleCodeExporter]

Now available in trunk.  Feel free to give it a try by enabling 
convert_jpeg_to_webp.  This is currently only enabled for recent Chrome and 
Opera releases (it's user-agent sensitive)

Original comment by jmaes...@google.com on 11 Jul 2011 at 10:05

• Changed state: Fixed

[GoogleCodeExporter]

thanks for this cool feature :)

Original comment by timo.witte on 11 Jul 2011 at 11:42