build changed for linux, must check for other OS
to avoid warnings, small changes

to avoid warnings, changed coltype to unsigned char, and removed some
code cleanup

removed some end-of-line spaces
Merge remote-tracking branch 'origin/maxstepin' into build-adjust
merged WIP branch from Max and partially updated Readme
OSX build issues had to do with zlib, fix was simple
small fix from missing cmake require script
wip, naming issues found
renamed resources
updated gitignore
Merge pull request #2 from apngasm/build-adjust

Build adjust