#52 share object file should be canonically named and versioned

[Robin Lee]

The current file name 'libjson_linux-gcc-4.7.2_libmt.so' is not canonical. 'libjsoncpp.so.0' may be a good name, and 'libjsoncpp.so' should be symlinked to 'libjsoncpp.so.0'. Some people can use -ljsoncpp to link the shared object.

After that, it would be great to provide a pkg-config file.

[Christopher Dunn]

In switching to cmake, we have (hopefully) fixed this. Also, pkg-config is available: https://github.com/open-source-parsers/jsoncpp/