getting pngquant version
checking pngquant version
pngquant worker (kudos to adammathys for #32 and smasry for #40)
add generated pngquant worker options to readme
add generator script and a 64 colour test png
add installation instructions for pngquant (linux, part of #32)
add installation instructions for pngquant (macports, part of #40)
add installation instructions for pngquant (brew and addition for debian/ubuntu old version)
add pngquant to travis
mention pngquant in readme and gemspec summary
reorganise before_install of travis
switch to building pngquant from source for travis
ignore images for worker analysis
Merge branch 'pngquant'
fix Space causing exception with negative numbers
change array returned from optimize_images, optimize_images! and optimize_images_data to caontain pairs of item and result instead of just result
fix order of results
use progress 3.0.1 to fix problem of results order
Merge branch 'fixes'
move advpng before optipng