[django/django] a80d9a: Initial version of MigrationOptimizer and tests

[GitHub]

Branch: refs/heads/master
Home: https://github.com/django/django
Commit: a80d9ab0fe25abdf80fd78849ddf5dd977f14316
https://github.com/django/django/commit/a80d9ab0fe25abdf80fd78849ddf5dd977f14316
Author: Andrew Godwin <and...@aeracode.org>
Date: 2013-10-02 (Wed, 02 Oct 2013)

Changed paths:
M django/db/migrations/operations/base.py
M django/db/migrations/operations/fields.py
M django/db/migrations/operations/models.py
A django/db/migrations/optimizer.py
A tests/migrations/test_optimizer.py

Log Message:
-----------
Initial version of MigrationOptimizer and tests