Update README.md

[skip ci]
Updated screenie
Updated README

[skip ci]
New icon idea
mac: add iconset
mac setup.py: add iconfile
homebrew formula: fixed setup.py sha1
Exported icon pngs

I think this should be enough for Mac?
Added icon to window icon and about dialog

Does that window icon look okay on windows? (and mac?)
Appearance dialog showing available values proper

Updated ui
Added appearance getters for assets and saves
mac: updated icon
Initial write support for appearance
New .ico file, delete unused icons
Dialog now sets values (some bugs?)

it keeps forgetting the hair subdirectory after the value is set?
build.py: added windoes icon + resources.qrc: remove link to deleted images
Apearance dialog now working!
Moved files to new gui module, renamed save_file
Larger icon for main windows (linux)
Color editing now functional
Make icons work on windows