improved required fields check before submission
Merge branch 'master' of https://github.com/alexcodreanu86/sinatra-flash-cards into alexcodreanu86-master

Conflicts:
	app/views/run_card.erb
fixed bug where submit buttons were disabled when they shouldn't have been on edit page.
Merge branch 'master' of https://github.com/thejessleigh/sinatra-flash-cards-master into alexcodreanu86-master

Conflicts:
	app/views/edit_card.erb