modify quiz types in form.
Merge pull request #100 from yuchan/modify-quiz-type-form

modify quiz types in form.
Adjust categories tags
Do not allow the field point of quizzes to null data. So we auto set it to "0" when user leave it blank to null in such field.
Merge pull request #101 from not001praween001/adjust-categories-tags

Adjust categories tags
Merge pull request #102 from not001praween001/do-not-leave-the-point-blank

Do not leave the quiz point(score) blank
Show the quiz's playing scores(points).
convert nil dat to 0.
REVERT TOTAL POINT AT LAYOUT VIEW.
REVERT again
REVERT again
Merge pull request #103 from not001praween001/about-the-total-point

Show the quiz's playing scores(points).
Merge pull request #104 from not001praween001/about-the-total-point

REVERT TOTAL POINT AT LAYOUT VIEW.