Allow CTools to process #dependency for date elements

Attached.

Uh, sorry. Forgot date was from core, so patch filed here: #1177220: Expand coverage of ctools_dependent_pre_render

Still, here's a patch for the various elements provided by the date modules.

Views still uses ctools's dependency system instead of #states. Within Views, to show another input only when a date is set to a given value, it needs to use this #pre_render callback.

I'm surprised git wasn't smart enough to figure that out.
Here's a reroll.

I normally don't try to fix coding standards in patches, but since I was modifying the code directly in that function, I figured it was reasonable. See http://drupal.org/coding-standards#array, the changes are valid.

However, in the interest of getting something committed, here are both patches.

@arlinsandbulte, After git am, make more changes, then git commit --amend will add those into the previous commit, then you can push.

EDIT: You should also research "git interactive rebase", git rebase -i, it's how you would combine unpushed commits that aren't sequential, among other things, and it is amazing. If you ever catch me on IRC, I'd be happy to walk you through it, or people in #drupal-gitsupport could explain it, or you can read about it online.