edX integration and CSS modifications

Some CSS modifications to singleStep and predictProducts, mainly to
predictProducts. Some edits made so that predictProducts is now
edX-embeddable.
Merge branch 'master' of https://github.com/csvoss/carbonate

Conflicts:
	orgo_django/app/templates/app/singleStep.html
	orgo_django/app/templates/app/singleStepHard.html
Added arrow to singlestephard
Merge branch 'master' of https://github.com/csvoss/carbonate

Conflicts:
	orgo_django/app/templates/app/singleStepHard.html