WebGLProperties: Rename deleteAll() to clear().

src/renderers/WebGLRenderer.js

@@ -182,7 +182,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 			setDefaultGLState();
 
 			objects.objects = {};
-			webGLProps.deleteAll();
+			webGLProps.clear();
 
 		}, false);
 

src/renderers/webgl/WebGLProperties.js

@@ -6,7 +6,7 @@ THREE.WebGLProperties = function () {
 
 	var properties = {};
 
-	this.deleteAll = function () {
+	this.clear = function () {
 
 		properties = {};