v0.1.5

Add support for single-child animations

Up until now, I've been working on the assumption that FlipMove will wrap around an array of elements. This assumption was challenged while building out the demos, as I wanted a single element to move around depending on state.

The problem is that React makes no attempt to convert single children to an array, so I had to do that manually, using the React.Children.toArray helper.

This release also includes a bunch of refactoring and improvements.