(CFACT-20) Implement JSON output.

Implementing JSON output of facts.
Implementing map_value to support complex fact values.
Implementing integer_value to support integer types in JSON output.
Fixing output of existing integer types.
Normalizing fact names taken on the command line.
Moving version header into facter library.
Changing install location into the default CMake install prefix (/usr/local/bin and /usr/local/lib).