Added validation on exzbike model to make sure that total for distance
and calories in both exercise and cool down match total distance traveled
and calories burnt.

 On branch master
 Your branch is up-to-date with 'origin/master'.

 Changes to be committed:
	modified:   app/models/exzbike.rb
	modified:   app/views/exzbikes/_form.html.erb
	modified:   db/schema.rb