OPEN gh-20: Restore "pure python" (e.g. no Numpy) support 
http://github.com/TheFeshy/mp3utensil/issues/issue/20

PythonRecordArray class and tests created
CLOSE gh-20: Restore "pure python" (e.g. no Numpy) support 
http://github.com/TheFeshy/mp3utensil/issues/issue/20

Created a pure python substitute for numpy record arrays.  It isn't
robust or portable, but it works suitably for its intended purpose here.
Unit tests for new class included.