add document, fix tooltip position issue

lib/ui/checkbox.d.ts

@@ -1,2 +1,13 @@
-export function createCheckbox(opts: any): HTMLElement
+interface CheckboxOptions {
+    type?: string;
+    label?: string;
+    checked?: boolean;
+    isImage?: boolean;
+    imageHeight?: Number;
+    checkedNode?: HTMLElement;
+    uncheckedNode?: HTMLElement;
+    onchange?: (this: HTMLInputElement, ev: Event) => any;
+}
+
+export function createCheckbox(opts?: CheckboxOptions): HTMLElement
 export function resolveCheckbox(container: HTMLElement): HTMLElement