Removed progress message for consistency
Removed CZMQ dependency from zproto

Problem: cannot run "make install" without CZMQ, and cannot make CZMQ
without installing zproto.

Solution: remove C link/compile from Makefile; as zproto depends on
multiple languages, each will have its own test process. Also, in
makefile, generate example code in all languages.

Fixes #93
Merge pull request #94 from hintjens/master

Removed dependency on CZMQ