Make dropdowns clearable (see semantic 2.4)

Author: jcheron

Ajax/semantic/components/Dropdown.php

@@ -40,4 +40,8 @@ public function setShowOnFocus($value){
 	public function setAllowAdditions($value){
 		return $this->setParam("allowAdditions", $value);
 	}
+	
+	public function setClearable($value){
+		return $this->setParam("clearable", $value);
+	}
 }

Ajax/semantic/html/modules/HtmlDropdown.php

@@ -396,4 +396,8 @@ public function jsAddItem($caption){
 		$js="var first=$('#{$this->identifier} .item').first();if(first!=undefined){var new =first.clone();first.parent().append(new);first.html('{$caption}};')";
 		return $js;
 	}
+	
+	public function setClearable($value){
+		$this->_params["clearable"]=$value;
+	}
 }