Serve robots based on environment

I stuck it shittily in the incidents controller because I'm lazy
Reorganize dev section, add collab section
Tweak incident form to comply with Boostrap div styling
Add favicon
Add annoying iOS icons
Move favicon resources to images directory [ci skip]
Fix validations and associations for Incident and Car
Merge branch 'master' into issue-9-create-car-model

Resolved conflict by taking the master's formatting and feature's nested vehicle block

Conflicts:
	app/views/incidents/_form.html.haml