Moved a number of modules into their own files.

selenium-webdriver/executors.d.ts

@@ -0,0 +1,13 @@
+declare module executors {
+    /** 
+     * Creates a command executor that uses WebDriver's JSON wire protocol. 
+     * @param url The server's URL, or a promise that will resolve to that URL. 
+     * @returns {!webdriver.CommandExecutor} The new command executor. 
+     */
+    function createExecutor(url: string): webdriver.CommandExecutor;
+    function createExecutor(url: webdriver.promise.Promise<string>): webdriver.CommandExecutor; 
+}
+ 
+declare module 'selenium-webdriver/executors' {
+    export = executors;
+}