zhash_load ignores lines starting with '#'
Trivial fixups
Set default HWM for pipes to 1,000
Merge pull request #221 from hintjens/master

Set default HWM for pipes to 1,000 as before
Added zsocket_unbind for completeness
Merge pull request #222 from hintjens/master

Added zsocket_unbind for completeness
Add unbind test
Merge pull request #223 from felipecruz/feature/test_zsocket_unbind

Add unbind test