empty questions needn't to be stored
Use multiple forms to replace the formset design.
Use form to replace formset.
Use prefix to distinguish different forms.
Add the cloneform.js file.
Add the "add question" button. Write CSS for the form.
Add the "add a question" button. Fix the clone form problem(now each clone keep 3 questions).
Merge branch 'yifan' into sumasia14
Merge pull request #8 from zxdvd/sumasia14

Redesign the form, a leap to a brand new vote creation mechanism! Thank zxdvd :-)