Initial commit done

I just uploaded the source code for Experi as it is. The code compiles, but there is no (functional) test cases yet. I need to fix a couple of API to get a test case working.

Experi now uses CMake instead of Autotools. My next goal are to fix the ex_program_start() and ex_program_stop() function and then create CTest cases. Then, we can start to have some fun!