Changed voting dialog to only display one tab per answer.

No tests for this, yet.

Conflicts:
	common/lib/xmodule/xmodule/crowdsource_hinter.py
	common/templates/hinter_display.html
Fixed tests to work with new vote-tabbing method.  Fixed some string-int incompatibility errors.

Conflicts:
	common/lib/xmodule/xmodule/crowdsource_hinter.py
	common/lib/xmodule/xmodule/tests/test_crowdsource_hinter.py