Add MathQuill.addCharsThatBreakOutOfSupSub()
Add MathQuill.disableCharsWithoutOperand()
Merge branch 'dev' into feature.SupSub-options

Conflicts:
	test/unit/typing.test.js
	- feature.smart-inequality #263 prepends an 'inequalities' suite
	- feature.SupSub-options appends a 'SupSub behavior options' suite
Merge branch 'feature.SupSub-options' into dev