Added the *play* project, as a reference project to the hdlmake tutorial, as well as an exampleof accessing SPEC registers via the *rawrabbit* driver.

git-svn-id: http://svn.ohwr.org/fmc-adc-100m14b4cha/trunk@131 ddd67a1a-c8ad-4635-afe9-0b8a11d8f8e4