Update docs after lexer changes

Allow passing visitors to NodeTraverser constructor

Minor documentation updates

More docs updates

Proofreading the docs - very minor changes!

Add name resolution, pretty printing component docs

The docs are receiving too little love...

Docs: Use PHP 7 return types (#405)

Update docs

Various docs fixes

Doc fixes

Update lexer docs for attribute options

Fix wrong function name in docs

Update lexer docs

Remove some very questionable examples for changing startLexing()
to accept a file name.

Add token offset lexer implementation and usage example.

Small docs touchups and typo fixes

Adjustment to documentation

Update docs to use new names

Improve some formatting

Add more extensive Lexer component docs