Smaller PNGs using Google's zopflipng

I tried this before so here's attempt 2.

All images were compressed using Google's official zopflipng tool. It can be downloaded from: https://code.google.com/p/zopfli/ . make zopflipng to compile. a C and a C++ compiler are needed(gcc and g++ in my case).

The command line used for all files was: `zopflipng --iterations=1000 --splitting=3 --filters=01234mepb --lossy_8bit --lossy_transparent x x`

where the x represents a given png file. Information given so that anyone can reproduce. It's terribly slow though.

edit: before I get asked about this, --lossy_8bit does not do anything as all the images are already 8 bits per channel. --lossy_transparent on the other hand removes redundant transparency information which results in a smaller file but no visual difference.