Project: organize folders

Organize project folders according to groups hierarchy.
It is not mandatory but the project directory is easier to read this way

Also move WelcomeViewController to Walkthrough folder and renamed
ViewControllers folder to Settings

Change-Id: Ica7b39ff57492435811d49ee9b6e0132dc597beb
54 files changed
tree: 97f2eadf92d6e1a0392b693d6a3f2692debe7dba
  1. Ring/
  2. .gitignore
  3. .gitreview
  4. compile-ios.sh
  5. COPYING