fix #721 - disable GC while scanning to prevent GC to dispose some AST members merged-on-behalf-of: BBasile <BBasile@users.noreply.github.com>
* Enable DScanner checking on Travis * Fix linter warnings * Set opequals_tohash_check to disabled * Set could_be_immutable to 'disabled' * Split expression back into multiple lines * Set style to disabled * Fix Makefile target