[Main_iPhone.storyboard] Code Cleanup: rearrange for iPhone 6+ size
[SMLRAgreeViewController] GUI Styling: Code Cleanup: element order
[SMLRAgreeViewController] GUI Styling: added constraints to center elements
[SMLRVerifyNumberViewController] GUI Styling: added constraints to center elements
[SMLRCreateAccountViewController] GUI Styling: added constraints to center elements
[CallViewController] more GUI styling
[CallViewController] now showes/hides network quality view
Merge pull request #5 from simlar/pullrequest-gui-styling-1

Pullrequest: Gui Styling 1