Isolate Xcode enforced file modifications

[wnagrodzki]

If Xcode modifies a file (xib, pbxproj, storyboard, xcdatamodel) before you make any editions to it, put those changes in a separate commit.

This is to make code reviews faster as Xcode changes can be ignored usually.

[wnagrodzki]

@pwetrifork @Moskacz What do you think? Any corrections needed?

[pwetrifork]

How about

If Xcode modifies a non user editable file

[pwetrifork]

I am not convinced myself about the above, what I miss here is some brief name for a modification that is not a result of the user actually editing something.