Fixes #661 -JsrExtension is missing hashCode() and equals()

jetty-websocket/javax-websocket-client-impl/src/main/java/org/eclipse/jetty/websocket/jsr356/JsrExtension.java

@@ -91,6 +91,23 @@ public class JsrExtension implements Extension
         return parameters;
     }
 
+    @Override
+    public boolean equals(Object o)
+    {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        JsrExtension that = (JsrExtension) o;
+
+        return name != null ? name.equals(that.name) : that.name == null;
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return name != null ? name.hashCode() : 0;
+    }
+
     @Override
     public String toString()
     {