Support for multiple classes

This release adds support for multiple classes. This can be of particular use when using atomic CSS classes.

To use, pass a string with a space-separated list of classes in your options:

const hr = new Headroom(element, {
  classes: {
    pinned: "first-class second-class", 
    unpinned: "third-class fourth-class"
  } 
});
hr.init();

v0.10.4

This release fixes a bug where classes such as top were not added when Headroom is initialised, only after the user first scrolls.

v0.10.3

This release contains a breaking change for IE11, with the introduction of Object.assign.

Please be aware this needs to be polyfilled if you wish to support IE11. Alternatively, you can wrap your initialisation code in a condition to avoid instantiation on unsupported browsers:

if(Headroom.cutsTheMustard) {
  // initialise headroom
}