add area question preview

add area question preview
Merge branch 'master' into Jack/AddAreaQuestion

Conflicts:
	js/controller/question.preview.js
fix conflict

fix conflict with master branch
fix confict

fix confict with master branch
fix confict with master

fix confict with master
fix conflict with master

fix conflict with master
change delegate form

change addPCDDelegate from *.delegate into events: {"": ""}
fix a spell fault

fix a spell fault
Merge pull request #16 from charleschu/Jack/AddAreaQuestion

WIP:add area question preview