add edit user's name feature.
Fix!
about show the name replace email(when do and listing the quizz).
Merge pull request #58 from not001praween001/about-username-edit

add edit user's name feature.
Merge pull request #59 from not001praween001/do-not-permit-editusername-oauth

about show the name replace email(when do and listing the quizz).
remove answers from index list.