Bumped version to 0.4.4

Changed respondToSwipe signature

Add Swift version to podspec file + format & lint the code

Made respondToSwipe method open and only requiring a direction.

Change default implementatino of isUndoable to true

Update README.md

Add unlimited undo functionality

Update version to fix custom size support

Fix issue with custom swipeView size.

Added support for any custom card size

Upgraded to Swift 4

Update podspec to reflect new version number.

Readded code to handle rapid swicks

Added more setup variants

Made it possible to actually modify the SwipeOptions