fix undefined start conditions error : https://github.com/zaach/jison-lex/issues/9
Simplify simple return statements.
Merge commit '27011c75cd472a6864fd749a036b474b8e03839f': fix undefined start conditions error #9; assume %x for missing start condition declarations.

Conflicts:
	regexp-lexer.js
Merge remote-tracking branch 'remotes/RubenVerborgh/compact-case-moduleInclude' + fix/tweak: Only aggregate simple lexer actions when they apply to *all* start conditions equally.

Conflicts:
	regexp-lexer.js