Add static page
Merge pull request #1 from nhattan/static-pages

Add static page
Finish Sign up
Merge pull request #2 from nhattan/sign-up

Finish Sign up
Finish Sign in
Merge pull request #3 from nhattan/sign-in-out

Finish Sign in
Finish user edit, update, index, destroy actions
Merge pull request #4 from nhattan/updating-users

Finish user edit, update, index, destroy actions
Finish create new category, word
Merge pull request #5 from nhattan/creating-word-category

Finish create new category, word
Finish creating answer
Merge pull request #6 from nhattan/creating-answer

Finish creating answer
Finish filter word by category
Merge pull request #7 from nhattan/improve-word-list

Finish filter word by category