Added support for safe area

Merge pull request #10 from umerjabbar/9-movement-of-targetedview-is-…

…going-beyond-safe-area-in-ios-170

Safe area support

Added support to change horizontal direction of menu

To change the direction you can use the following code:

CM.MenuConstants.horizontalDirection = .right
or
CM.MenuConstants.horizontalDirection = .left
or
CM.MenuConstants.horizontalDirection = .center