started abnf branch, and made a file with a parser in it (no reductions yet) and I'm not sure if it works or not
Fixed handling of nullable plus parsers.

Need to test this more thoroughly before merging it in to 1.1, but it is
looking good so far.
Separated enhancements from new features in CHANGES.md
the parser now works, but no transformations yet
fix for get-line that works on empty last line
Merge branch 'v1.1' into abnf
Merge branch 'nullable-plus' into v1.1
Fixed nullable plus bug
Updated change log with nullable plus bug fix
abnf now works, need to make the parser more flexible and the program more user-friendly
added the ABNF core rules (like ALPHA), and added a test file
Merge branch 'abnf' of https://github.com/aengelberg/instaparse into abnf
removed ambiguity from the grammar
Merge branch 'abnf' of https://github.com/aengelberg/instaparse into abnf
Working on abnf perf
Switched reductions to maps, rather than fns.
tweaking debug statements in gll
abnf tests
Used regexes to simplify handling of whitespace and comments
Smart merging of core rules