Parsing the OData ABNF

[kenb <kenb@ccs.neu.edu>]

I tried to parse the ABNF grammar statements from the core (OData 
ABNF.markdown) and found some syntax errors, such as mismatched 
parentheses, undefined terms, etc. Also quite a few of the rules are 
undefined (with comments indicating what they should be).  It was easy 
to fill in the ones that specified an RFC, but many others had no 
citation.  How should these be handled?

-- Ken Baclawski