Fix for https://github.com/bripkens/lucene/issues/9 #10
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Don't know if everything is in place... automated tests seems to hold. Probably not the most elegant and effective solution on on the peg grammar but.. it was my first time and I just copy pasted (don't know anything about PEG syntax).
I've added for both parse and to_string:
with their relative tests too.
Please review :)