Added 'required' attribute to required form fields
Change of opacity on submit buttons and make disabled on empty field
Merge branch 'form' of github.com:tagawa/webcompat.com into tagawa-form

* 'form' of github.com:tagawa/webcompat.com:
  Change of opacity on submit buttons and make disabled on empty field
  Added 'required' attribute to required form fields

Conflicts:
	webcompat/templates/form.html