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

Note: Currently there aren't any strings or images in code to localize, so this just sets up the framework to make localization as we develop relatively trivial.