Various layout fixes and code cleanup:
- Turning off wantsFullScreenLayout on all UIViewControllers in MainStoryBoard_iPhone.storyboard. This is only meant to be used when you want your view controller content to appear behind the status bar. Minor changes to constraints in MainStoryBoard_iPhone.storyboard that were based on view controllers being full screen. Minor layout changes in ItemsViewController.m, OpsViewController.m, PortalDetailViewController.m to reflect view controllers no longer drawing behind status bar. Fixes issue #345 where "Resources", "Portal Keys" and "Media" would appear behind status bar if you closed and reopened OPS.
- Removed viewDidLayoutSubviews from PortalDetailViewController.m, no longer needed.
- Removed statusBarHeight method from Utilities.m, no longer needed.
- Changed diameter of pie chart in ScoreViewController.m to calculate based on the width of the view. Fixes issue where it wasn't drawing correctly on iPads.
- Added constraint to trailing edge of image at top of PortalDetailViewController, so that image is drawn across the whole view on all devices.