Add missing focal point fields migration for django>=1.7.

[RoPP]

No description provided.

[kaedroho]

Hi @RoPP Thanks!

When we added Django 1.7 support, we squashed all our south migrations into the initial migration so these fields should be added here: https://github.com/torchbox/wagtail/blob/master/wagtail/wagtailimages/migrations/0001_initial.py#L39-L42

[gasman]

@kaedroho It looks like Django 1.7 wants another migration as a result of adding blank=True in 807aa1e, even though this shouldn't make any difference at the database level - I also saw this one coming up when I ran makemigrations for 7a2394c.

[RoPP]

@kaedroho I had not noticed that all migrations go in 0001_initial but it should be good now.

[gasman]

@RoPP Sorry, I think there have been some crossed wires here!

The original commit was good - @kaedroho wasn't asking for it to be merged into 0001_initial (since that would defeat the object of having migrations in the first place - people upgrading Wagtail wouldn't get the update). He was just pointing out that these fields appeared to be in place already (which is true, but the new migration was updating them, not adding them). No worries, I'll sort this :-)