added iosStoryboardExample

the new iosStoryboardExample demonstrates how ios storyboards can be
used with openframeworks.
Merge pull request #2803 from julapy/ios-storyboard-example

added iosStoryboardExample
setting the root application path inside ofxiOSAppDelegate was messy - cleaned up to one succinct line.
Merge pull request #2804 from julapy/ios-datapathroot-clean

cleaned up code for setting the root application path inside ofxiOSAppDelegate.
iOS-Storyboard Example Fix for <iOS7

-Fix for iOS 5 and iOS 6 Buttons
Merge pull request #2805 from danoli3/iOS-Storyboard-Fix

iOS-Storyboard Example Fix for <iOS7
gstVideoPlayer: fix filename -> uri
Merge branch 'master' of github.com:openframeworks/openFrameworks
Merge pull request #23 from openframeworks/master

update openframeworks