extract #dump_count from cucumber-ruby history
extract #dump_count from cucumber-ruby history

- The dump_count method was previously found in
  Cucumber::Formatter::Summary and Cucumber::Formatter::Html
- This method was extracted from
  <https://github.com/cucumber/cucumber-ruby/commit/4154c8ca>
- Closes #36
  <https://github.com/guard/guard-cucumber/issues/36>

guard/guard-cucumber