Log Message:
Changes 1.7.4:
* Fixed a migration crash when unapplying contrib.contenttypes’s or \ 
contrib.auth’s first migration.
* Made the migration’s RenameModel operation rename ManyToManyField tables.
* Fixed a migration crash on MySQL when migrating from a OneToOneField to a \ 
ForeignKey.
* Prevented the static.serve view from producing ResourceWarnings in certain \ 
circumstances.
* Fixed schema check for ManyToManyField to look for internal type instead of \ 
checking class instance, so you can write custom m2m-like fields with the same \ 
behaviour.