Merge pull request #2 from thanhlai/Thanh

Thanh
Change type of character and stage in database. Add 2 functions: create new character and get all character.
Merge pull request #3 from thanhlai/Danny

Change type of character and stage in database. Add 2 functions: create ...
Add 4 new function: edit, delete character, update stage and character
Merge pull request #4 from thanhlai/Danny

Add 4 new function: edit, delete character, update stage and character
Added ChangePassword endpoint