Allow lints to accept configurations

[a14n]

It would be useful and nice to be able to customize some lints with parameter/configuration.

For instance:

linter:
  rules:
    - file_headers:
        pattern: '// Copyright 2015 The Chromium Authors. All rights reserved.\n// Use of this source code isgoverned by a BSD-style license that can be\n// found in the LICENSE file.'
    - prefer_const_declarations:
        local_variables: false