fix cleanup of selectgroup test

as it was copied from radiogroup test before that got fixed it had the same issue leaving the test div behind.
Merge pull request #51 from seannives/seann

initializing eventmanager in init, not in the getter method
refactor button widget to have draw method

this breaks all pages which use buttons. I've updated the button test page, but there are more.
Merge pull request #52 from mlippert/widget-refactor

Button widget refactor to use draw
the question now starts with the submit button disabled
Merge pull request #53 from mlippert/widget-refactor

the question now starts with the submit button disabled
start of clientside scoring
First pass static answer engine

- creates static scored object
- scores based on input value, not node lookup
- handler expanded to produce several types of response boxes (correct, wrong, partially correct)
Changing Prototype to use RequireJS.  content.html looks at the minified library which contentAMD loads things within the script (mainly for debugging).
Merge remote-tracking branch 'upstream/master' into seann