Modified some constrains to works on iOS8 and iPhone6. closes #396

the constraints used on FeedbackViewController (with some smoothly managed exceptions) and EditTimeEntryViewController works better.
fixes #396
Yeah, it's better to just update them, but it's a hassle when you're replacing them, not just tweaking some value of existing ones. Thus it was easier to remove constraints, but I guess it also removed constraints which other views applied to that view, thus braking other things again.

What I don't seem to get is that in places where you have removed clearing the constraints you keep adding new constraints but it doesn't create a conflict? Why? What/where removes the old constraints?