Merge pull request #178 from onevcat/fix/xcpretty

Add xcpretty for better ci output

.travis.yml

@@ -4,4 +4,4 @@ osx_image: xcode7.1
 xcode_workspace: Kingfisher.xcworkspace
 xcode_scheme: Kingfisher
 
-script: xcodebuild -workspace Kingfisher.xcworkspace -scheme Kingfisher -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 6,OS=latest' test
+script: xcodebuild -workspace Kingfisher.xcworkspace -scheme Kingfisher -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 6,OS=latest' test | xcpretty