Make charclass simplifier work with negated classes too
Add a checker for simplifying character classes
Move charclass to a regular module; simplify imports
Update copyright year
Fix a couple of bugs in charclass simplification
Add DEMOOPTS to Makefile

Allowing you to still use the collection of lexers, but with your own options
(e.g. --no_parallel)
Merge remote-tracking branch 'github/master'