Added deconstruct functionality and cleanup code so that everything gets correctly cleaned up once a element is removed from the DOM. Added a new property template that allows properties to be used as content or html anywhere within a template's children. Next up is slot support.

src/ignite-html.js

@@ -1,6 +1,6 @@
 class IgniteProperty {
     constructor() {
-        this.onPropertyChange = [];
+        this.callbacks = [];
         this._value = null;
     }
 
@@ -12,17 +12,41 @@ class IgniteProperty {
         var old = this._value;
         this._value = val;
 
-        for (var i = 0; i < this.onPropertyChange.length; i++) {
-            this.onPropertyChange[i](old, val);
+        //Invoke any callbacks letting them know the value changed.
+        for (var i = 0; i < this.callbacks.length; i++) {
+            this.callbacks[i].invoke(old, val);
+        }
+    }
+
+    attach(onChange) {
+        var callback = new IgnitePropertyCallback(this, onChange);
+        this.callbacks.push(callback);
+        return callback;
+    }
+}
+
+class IgnitePropertyCallback {
+    constructor(property, callback) {
+        this.callback = callback;
+        this.property = property;
+    }
+
+    invoke(oldValue, newValue) {
+        if (this.callback) {
+            this.callback(oldValue, newValue);
+        }
+    }
+
+    disconnect() {
+        this.callback = null;
+
+        if (this.property) {
+            this.property.callbacks = this.property.callbacks.filter(callback => callback != this);
+            this.property = null;
         }
     }
 }
 
-class IgniteAttribute {
-
-}
-
 export {
-    IgniteProperty,
-    IgniteAttribute
+    IgniteProperty
 };