.gitignore
Add requirement for ply. Use it in most braindead fashion.
gitignore parser tmp files
first working unit test based on imp stolen from  'classcalc' ply example
return value of parse operation via normal ply mechanism,
rather than accumulating in 'result'. Now handle parsing of empty string
by introducing top level 'document' element, that may either be blank
or contain an assignment
handle comments
handles string values
now handle multiple assignments