added unknownsymbol
Merge branch 'master' into unknownsymbol
basic ideas about unknown grammars
Merge branch 'master' into unknownsymbol
Merge branch 'master' into unknownsymbol
lexer now generates unknownsymbol
Merge branch 'master' into unknownsymbol
removed unused code, small fixes
added Validate test
added missing variable
fixed import
fixed grammar name
Merge branch 'master' into unknownsymbol
some notes and improvements
refactored validation code
load_parser try to load grammar first
updated test code to reflect Validate module deletion
deleted production information from terminal symbols
added alphabet member to GrammarDefinition
removed summary function call