Improved linux packaging

I've finally set up a 64 bits environment and improved the packaging script so the arch name of the building machine is included in the tarball.
It will looks like:
* kroniax_0.5.2-linux_x86_64.tar.gz
* kroniax_0.5.2-linux_i686.tar.gz

Also fixed CMakeLists.txt (Tracer.cpp was missing).