Added remove capability to scatter.(Merged local branch 'scatter')

lib/scatter.js

@@ -372,6 +372,13 @@ export class AbstractScatter extends Throwable {
     close() {
         if (this.onClose) {
             this.onClose.forEach(callback => callback(this))
+
+            /**
+            Removes self from container when it's closed.
+            */
+            if(this.container){
+                this.container.remove(this)
+            }
         }
     }
 
@@ -1000,6 +1007,24 @@ export class DOMScatterContainer {
         }
     }
 
+
+    /**
+     * Removes an element from the scatter.
+     *
+     * @param {Scatter} scatter - Element to remove.
+     * @memberof DOMScatterContainer
+     */
+    remove(scatter){
+        this.scatter.delete(scatter.element)
+    }
+
+
+    /**
+     * Adds an element to the ScatterContainer.
+     *
+     * @param {Scatter} scatter - Element to add to the ScatterContainer.
+     * @memberof DOMScatterContainer
+     */
     add(scatter) {
         this.scatter.set(scatter.element, scatter)
     }