Merge pull request #172 from jemc/master

Problem: String return values for API methods are not const
Add explicit cast to zhash_cursor calls

Problem: The zhash_cursor function returns const void * and the
zproto_codec_c assumes that it return const char *.

Solution: Add explicit cast to zhash_cursor calls.
Merge pull request #173 from danriegsecker/master

Add explicit cast to zhash_cursor calls
Revert "Add explicit cast to zhash_cursor calls"
Merge pull request #174 from zeromq/revert-173-master

Revert "Add explicit cast to zhash_cursor calls"
Problem: need send/recv msg capability in client API

Solution: generate this. Malamute-core has an example client XML.
Merge pull request #175 from hintjens/master

Problem: need send/recv msg capability in client API