add definitions for Headroom

Headroom/headroom-tests.ts

@@ -0,0 +1,13 @@
+/// <reference path="headroom.d.ts" />
+
+new Headroom(document.getElementById('siteHead'));
+
+new Headroom(document.getElementsByClassName('siteHead')[0]);
+
+new Headroom(document.getElementsByClassName('siteHead')[0], {
+	tolerance: 34
+});
+
+new Headroom(document.getElementsByClassName('siteHead')[0], {
+	offset: 500
+});

Headroom/headroom.d.ts

@@ -0,0 +1,28 @@
+// Type definitions for headroom.js v0.7.0
+// Project: http://wicky.nillia.ms/headroom.js/
+// Definitions by: Jakub Olek <https://github.com/hakubo/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+interface HeadroomOptions {
+	offset?: number;
+	tolerance?: any;
+	classes?: {
+		initial?: string;
+		pinned?: string;
+		unpinned?: string;
+		top?: string;
+		notTop?: string;
+	};
+	scroller?: Element;
+	onPin?: () => void;
+	onUnPin?: () => void;
+	onTop?: () => void;
+	onNotTop?: () => void;
+
+}
+
+declare class Headroom {
+	constructor(element: Node, options?: HeadroomOptions);
+	constructor(element: Element, options?: HeadroomOptions);
+	init: () => void;
+}