Remove empty README file.

It's confusing enough that there is three different README files. Now
it's only two thirds as confusing.

Signed-off-by: Shannen Saez <shannenlaptop@gmail.com>
Merge pull request #296 from hintjens/master

Fixed to make work with ZMQ v3.2
Merge pull request #299 from shancat/feature/remove_empty_readme

Remove empty README file.
Small improvements to zlist

- improved some method documentation
- zlist_dup now copies autofree property as well
Trivial code cleanups
Removed empty ChangeLog