Eject Tools

We can easy to get out from immutable-array-prototype to native array methods.
This concept will be realized by tools like [jscodeshift](https://github.com/facebook/jscodeshift "jscodeshift").

The issue names no files, tests, or entry points; begin by examining the immutable-array-prototype repository to determine what “eject” means and how jscodeshift would be involved. Before implementation, clarify the migration scope and define the expected result for replacing immutable-array-prototype usage with native array methods.

索引モデルが issue の本文から書いたものです。