Configurable Focus Algorithm should accept multiple algorithms.

[Duder-onomy]

The user should be able to configure many diff finding Algos into mff. The one marked as default will run as default. Th others can be switched too via a configure() call, or inline on the element as focus-flavors attribute.

...naming to be determined

Mff.configure({
   distanceAlgo  : {
        findDistance : function() {},
        IsDefault : true
})

Mff.addDistanceAlgo( ***options*** );

Mff.removeDistanceAlgo();