Feature/i18n

Add localization support for:
  - Storyboard via Base Internationalization
  - Strings in source, with a demo of use in ContactsSearchViewController.m

HOWTO: Localize a file (strings files, img files, plist files, etc)
  - Click file in Project Navigator
  - Click File Inspector in right sidebar
  - Click giant "Localize" button and select languages you want to localize for