Update 12-qunit.md

store not in scope, should be "Store" in QUnit sample code.
Fixed Store unrecognized variable name and parentheses

Same parentheses problem as yesterday. Store variable also mistyped in sample code
Merge pull request #430 from KevinTCoughlin/gh-pages

Fixed Sample Code: Parenthesis on Ch 14 and "Store" variable name Ch 12 and Ch 14