Finish 0.3.2
Improve specs.
RBX 2.1.x updates.
Make rule identifier optional.
Update Gemfile for JRuby to not depend on rocco or redcarpet.
Create literate description of EBNF parser example.
Move rocco stuff to debug group to avoid using in Travis.
Change git URL for rocco.
Added EBNF writer used for #to_s implementation to generate formatted EBNF from AST.
Progress on updating EBNFParser example.
Add _diff_1 sub-production to EBNF example parser.
Improve error formatting, and always output errors to $stderr.
Version 0.3.3.
Finish 0.3.3