Clean up automation tasks

ROOT_DIR not being set was causing rake automation:web:features[...] to fail.

Also, web_steps isn't provided by cucumber by default anymore (see: https://github.com/cucumber/cucumber-rails/blob/f027440965b96b780e84e50dd47203a2838e8d7d/History.md)

The create symlinks task looks like its just deleting things... doesn't make sense to me.