CMake

Hello,

Here is my attempt to "cmakify" msgpack-c library. The support is basic and there is still few things to do (like INSTALL command, removing Makefiles, automake scripts and so on) thought you are able to build msgpack library in your project using ADD_SUBDIRECTORY. This was my primary goal.

Preprocess script is fully integrated within CMake script. It calls Ruby that generates header files.

I have also removed Visual Studio projects and solutions which are completely useless now. To generate Visual Studio solution you have to run CMake with proper -G switch.