Added cmake files.

https://github.com/msgpack/msgpack-c/pull/20
Removed 'preprocess' from original CMakeLists.txt.
Removed file copy from original CMakeLists.txt.

Removed 'preprocess' from bootstrap.
Removed file copy from bootstrap.

Added erb generated files. Ruby is no longer required.
Moved cases.mpac, cases_compact.mpa, pack_define.h,
pack_template.h, unpack_define.h, unpack_template.h,
and sysdep.h to apropriate location.

If you want to re-generate zone.hpp, define.hpp, and tuple.hpp,
then you execute preprocess.