Relocated third party code into the src folder.
Initial work at moving over to autotools for building. libschwa appears
to be built correctly. Apps and unit tests still to go.
Upgraded to UnitTest++ v1.4 as it has autoconf support.
Added the unittests back in, being conditionally compiled and run by
`make check`.
Added missing Config.h from UnitTest++. Misc autotools tweaks for linux.
Added support for building the non-ZMQ binaries in autoconf.
Added conditional buildling of ZMQ components based on presence of
libzmq >= 3. A better solution is probably needed for
src/lib/schwa/dr-dist/*.cc when ZMQ is not provided. There should be a
way for a user to detect if this library was compiled or not.
Updated doxygen doc generation and ragel source code generation targets.
Corrected include and link paths in pkg-config file.
Merge remote-tracking branch 'origin/autoconf'