fix bug

fix bug when no area checkbox is checked
add edit area question

add edit area question using jquery.tmpl()
add "max_num " and "min_num " in survey
add "areaType" in survey
fix backend
fix conflict
Merge remote-tracking branch 'origin/vivian/add-style-031213' into herbert/backend-integration
Merge pull request #25 from charleschu/herbert/backend-integration

Ready: backend integration refactor