This was managed with a special options file, but we don't need that now that tags in rake task's rspec_opts can override those in .rspec.
There are still some emitted by upstream dependencies. - Closes #488.
- this had not been necessary since we introduced bundler to the dev environment, but it never caused a problem until we moved the location of the rspec exe. - Fixes #411.
- Allows us to have an always-up-to-date gemspec. - Use bundler's build/install/release rake tasks rather than jeweler's. - One less development dependency. - No need for a separate VERSION file.
This means each scenario doesn't need to 'bundle exec' and cukes run much, much faster.