• Delete header comment
• Fix syntax

Fixed settings

• Set SWIFT_SWIFT3_OBJC_INFERENCE to Default

Update project setting #16

Support Swift4.1 #17

Supports layout for iPhoneX in Example project #15

Adds isItemRotationEnabled for circleRotation.

Supports Xcode 9 and Fix warning.

• Update project settings for xcode 9
• Delete redudant protocol

Supports Swift4.

• Supports swift4

Fixed compiler error for Swift 4

• Refactoring backgroundColor(withDistanceRatio:)