Refactor create using promise.
Remove unused file.
Simplify format backbone model.
Simplify format backbone collection.
Refactor format find.
Move camelize-keys, snake-case-keys into utils.
Put formatters in a separated folder.
Move find in middlewares, options can now be specified by default.
Clean backbone formatter test.
Refactor update, support withRelated.
Externalize where formatter.
Format sortBy correctly.
Refactor findAll.
Refactor destroy.
Code style.
Refactor create.
Code style.
Refactor checkExist.
Remove search.
Expose middlewares correctly.