rake/iphone: add optional usage of xcpretty gem for better compilation output
rake/iphone: add optional usage of xcpretty gem for better compilation output

louisatome/rhodes,louisatome/rhodes,louisatome/rhodes,UIKit0/rhodes,UIKit0/rhodes,louisatome/rhodes,UIKit0/rhodes,UIKit0/rhodes,UIKit0/rhodes,rhosilver/rhodes-1,rhosilver/rhodes-1,louisatome/rhodes,rhosilver/rhodes-1,UIKit0/rhodes,rhosilver/rhodes-1,louisatome/rhodes,UIKit0/rhodes,louisatome/rhodes,rhosilver/rhodes-1,rhosilver/rhodes-1,rhosilver/rhodes-1,UIKit0/rhodes,louisatome/rhodes,UIKit0/rhodes,rhosilver/rhodes-1,UIKit0/rhodes,rhosilver/rhodes-1,rhosilver/rhodes-1,louisatome/rhodes