How to use the Bangle.js Layout library

This looks pretty neat, hopefully I'll have some time to play with it this weekend.

Would it be bloaty to add something like this (untested):

  Layout.prototype.setLabel = function(id, label) {
      var l = this._l;
      if (l[id].label !== label) {
          this.clear(id);
          l[id].label = label;
          render(id);
      }
  }

(or even add it to txt/btn elements, so you could just do layout.date.setLabel('New label'))

Just because I expect otherwise the compare-clear-update-render code will probably show up in pretty much all apps anyway.