Automate cucumber tests bisecting by providing a `git bisect` script.
Because it is stored in source control, but bisecting changes the HEAD,
it is advised to first copy over the script to a place outside source
control, e.g. `/tmp`.
Usage:
git bisect start HEAD HEAD~10
bit bisect run /tmp/bisect_cucumber.sh
This automatically configures and builds OSRM, spawns the cucumber tests
and communicates with `git bisect` based on its return code.
Reference:
- man git-bisect
