supported loading libzmq from JAR. fixes zeromq/jzmq #180.

Tested on MacOS X (Mavericks), Linux (Crunchbang Waldorf, a Debian Wheezy-based distro) and Solaris 11 x86. All work fine, able to run local_lat & remote_lat on a bare machine without libzmq or jmzq libraries installed. The one issue I hit was with Solaris 11 -- note that you need to build with "CXXFLAGS=-m64" or it will build 32-bit ELF libraries. These won't load on a 64-bit JVM.