Merge remote-tracking branch 'upstream/master'
All working crud
Added search bar
Update edit/delete buttons to be new hash style (which probably due to my error, was not working last night, hence the old style in previous commits.
Added Engine model and viewed it in the form, show and index.
Add engine model.
Fix show view for vehicles without engines assigned.
backup of working code as i am about to break it
cars app homework done
Added engine files
initial homework commit
Engines added, show, update, delete working.  New, not working.
cars update error
cars update error
cars update error
cars update error
cars update error
cars update error
Unable to create or edit
code working