DiagnosticErrorListener includes rule names for each decision in its reports
Document ANTLRErrorListener and DiagnosticErrorListener (fixes #265)
Merge pull request #273 from sharwell/fix-265

Document ANTLRErrorListener and DiagnosticErrorListener
Extend the supported input character range to include all UTF-16 code points (specifically, U+FFFF is now supported, fixes #267)
Only serialize unique sets (smaller serialized ATN)
Use standard 0-based indexing
Merge pull request #274 from sharwell/fix-267

Support character U+FFFF
Merge branch 'master' of github.com:antlr/antlr4
update boostrap and python graphers
fixed timing in boostrap