revised multiple choice questions
fixed conflict in multiple choice questions
New audio tour on activecode and changes to multple choice.

new audio tour on activecode.  new multiple choice quetion in chapter 3
(turtles) showing using pictures in quetion and answers.  Rewording of
some mutliple choice questions.  Added local storage for multiple
choice quesitons with multiple feedback.
Merge branch 'master' of https://github.com/ericsonga/runestone
Merge branch 'master' of github.com:ericsonga/runestone into ericsonga-master

Conflicts:
	modules/luther/sphinx/activecode/activecode.py
	source/GeneralIntro/introduction.rst
	source/MoreAboutIteration/moreiteration.rst
	source/PythonTurtle/helloturtle.rst
	source/Selection/selection.rst
	source/SimplePythonData/simpledata.rst
Remove  and ignore .DS_Store files from OS X.
including jquery and jquery-ui in the directive was redundant and caused jquery errors.