Updates start code to iOS 7 and Xcode 5.
Updates main storyboard to Xcode 5.
Updates Main.storyboard name.
Chapter 1 exercises
Merge remote-tracking branch 'origin/chapter1'

Conflicts:
	chapter01/InstaTwit/InstaTwit.xcodeproj/project.pbxproj

chapter01/InstaTwit/InstaTwit/Images.xcassets/AppIcon.appiconset/Content
s.json
	chapter01/InstaTwit/InstaTwit/en.lproj/Main.storyboard

chapter04/SpinCity/SpinCity/Images.xcassets/LaunchImage.launchimage/Defa
ult.png