Added ability to open child pane custom view controller using storyboard id

use IASKViewControllerStoryBoardId specifier to .plist
fixed indentation
updated readme
Ignore .xcuserdata
silence compiler warnings when implementing custom settings store (by @mman)
Fixed removal of NSUserDefaultsDidChangeNotification

close #234
Sample App: iOS 7 modifications

close #224
Support ShortTitles for Multi Value Elements (introduced in IOS 5.0)

thx @meizy
Fixed warnings and modernized build settings
Merge branch 'master' into child-pane-from-storyboard-id

Conflicts:
	InAppSettingsKit/Controllers/IASKAppSettingsViewController.m
fixed open from storyboard not working cause of merge
Fixed issue with CUICatalog: Invalid asset name supplied: (null), or invalid scale factor: 2.000000
added ability to use any story board, defaulting to MainStoryBoard if not stated
updated README.md to info about IASKViewControllerStoryBoardFile
Merge pull request #212 from dannyshmueli/child-pane-from-storyboard-id

Added ability to open child pane custom view controller using storyboardId (new)
Fixed deprecation warnings, removed iOS 4 support
Display chevron for left-aligned buttons
Restore statusBarStyle for Mail view controller

http://stackoverflow.com/a/19189317/235297

Restore navigation bar appearance also when launched from WebViewController
Made all <IASKSettingsStore> accessors @required

They actually are required but are already implementing when subclassing the IASKSettingsStore abstract implementation
Fixed weak warnings