Add a missing #import for git_submodule
Add some missing casts
Fix warning about printing SEL directly.
Update calls for sheet management to non-deprecated versions
Update NSFileManager usage + error checking
Fix "dangling else" warning
Fix "direct comparison undefined" warning

Also adds pretty defines for magic values.
Remove workaround for 10.5
Remove a duplicated ivar

Let's use GTRepository's `configuration` directly.
Make PBGitRepository stick more closely to NSDocument's conventions
Remove CoreData template code.

The xib change is *just* disconnecting -saveAction: from the Save menu item.
Remove observations when PBGitHistoryList gets dealloc'ed
Don't cast integer types for format strings; we use the correct formatter
Add pull request #193 to the change log
Merge branch 'issues/193'