Add CMake build scripts

The CMake scripts build the test code and uses CMake's built-in CTest
capability. To build and run the tests, for example, do:

    $ mkdir bin && cd bin
    $ cmake ..
    $ make
    $ make test

Although this will run the tests, no checking of output is actually done
since that code does not exist. What is needed is something like what
has been started in the boost_tests folder.