Added read only ability to chip list and chip.

chip.js

@@ -10,7 +10,8 @@ class Chip extends IgniteElement {
         return {
             onDelete: () => { },
             background: null,
-            color: null
+            color: null,
+            readOnly: false
         }
     }
 
@@ -48,6 +49,7 @@ class Chip extends IgniteElement {
                     .style("line-height", "1")
                     .style("border", "none")
                     .onClick(() => this.onDelete())
+                    .hide(this.readOnly)
             );
     }
 }