add simple Makefile for mingw32
Merge pull request #121 from pijyoi/master

add simple Makefile for mingw32 build
Clarified zlist autofree method
Clarified API
zlist_remove allows for iterative removal of items
Upgraded to C4.1
Merge pull request #123 from xekoukou/master

allow for iterative removal of items
Merge pull request #124 from hintjens/master

Upgraded to C4.1