What is accuracy to safely use CI migration ?

@luckmoshy The Migration dose not work as you expected.
It is the point you misunderstanding.

The migration is like simple or stupid Git repository.
`spark migrate` is like `git commit`.

How many migration files you have, when you run `spark migrate`,
the migration executes all migration files, and create a batch number starting from 1.

When you run `spark migrate` again,
the migration executes all new migration files, and create a batch number 2.

You can see the batch numbers:

Code:

$ php spark migrate:status

You can go back to the state of arbitrary batch number with `spark migrate:rollback`.

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