Rule based ignores

Currently coala can ignore rules based on in-source comments.

That can get very messy when particular rules sgould always be ignored in common but well defined scenarios.

In those case it is better to define a rule *about* the relevant lines.

See flake8-putty, which uses regex to describe scenarios.
The solution for this project should be more generic that flake8-putty, possibly using bears to define ranges when custom actions which ignore results.