Adding filter to skip individual checks during review.

If a "vip-scanner-skip-$check" filter returns true the check will be skipped. Skipping a check generates a warning. `$check` is the name of the check.

Analyzers can also be skipped using this same filter.
Renaming skip check filter.

Renaming the filter `vip-scanner-skip-$check` to `vip_scanner_run_check`
and passing `$check` as a variable to avoid having data in the filter
name.

From feedback received on #92
Merge pull request #92 from Mobius5150/skip_checks

Adding filter to skip individual checks during review.