Merge branch 'tarruda-poc/0.6' into poc/0.6
Added char* packing support. char* is packed to STR similar as std::string.
See https://github.com/msgpack/msgpack-c/issues/110
Updated version getting mechanism.
Versions are gotten from version_master.h
Fixed -Wextra warnings on gcc.
correct paths for x86_64/generic installations
inline default_reference_func to avoid multiple definition errors
Renamed the last digit of version string from RELEASE to REVISION.
Added REVISION macro and getting API.