Merge pull request #104 from jocelynlih/paul

Just cleaning up the paper background and master template.
Adding playground for Preface
Merge branch 'master' of https://github.com/jocelynlih/SwiftGameBook
Moving folder
Beta 7 Fixes, making the game harder and refactoring code
Making the game slightly easier
Merge pull request #105 from jocelynlih/ankur-beta-7-fixes

Beta 7 Fixes, making the game harder and refactoring code
Update README.md
add currentLevel in gamescene

to avoid hard coded level. Clean up the code
Merge pull request #106 from jocelynlih/jocelynGameSceneCodeCleanup

add currentLevel in gamescene
Update README.md
Add new assets to game and update level 3 for outdoor art and background
Add new outdoor assets to atlas and use new assets on level 3.
Merge pull request #107 from jocelynlih/jocelynAddMoreArt

add outdoor art
add stone art and new level select screen
Merge pull request #108 from jocelynlih/jocelynAddMoreArt

add stone art and new level select screen
Update README.md
update read me
update readme
Adding leaderboard and fixing some bugs