addition of a point to point entry type/category to allow people to discuss route optimization for busses

Inspired by a comment from DevPost viewable [here](http://devpost.com/software/mobility-map/updates/37076?ref_content=update-comment&ref_feature=update-comment&ref_medium=email&utm_campaign=update-comment&utm_content=new_update_comment&utm_medium=email&utm_source=transactional).

> [Duende Tao](http://devpost.com/duende)
> Great project and I really like the simplicity and accessibility for the end user. If possible, I would like to see an addition of a point to point entry. Mobility Map could perhaps already include that feature and I did not see it in the video, however an ability for users to make constructive criticism on a whole route, or point to point would assist clarity in many cases and be useful indeed. Keep up the good work!