"make clean" should get rid of all builds, not just the active one.
Created a variadic add() function on zmqpp::message_t, and a variadic constructor which delegates to it. Also created a variadic extract() function for retreiving values. Although get() would have been more consistent with the existing interface, a variadic get() was not compatible with the existing methods.
Merge pull request #36 from LindleyF/develop

Develop