Various autoconf and build fixes

This request contains not only the fix for issue #3, but also a similar fix for x_ac_zeromq.m4.
Additionally I added
 - Update test for json pkgconfig to look for json-c.pc as well as json.pc (Required for Ubuntu 14.04)
 - Add a test for uuid.pc pkgconfig required by build

The final two commits are debatable. I enabled silent rules for automake. Not necessary
but it cleans up a lot of noise in the build, allowing more chance to see warnings as they
go by during build.