add path-to-regexp definition.

path-to-regexp/path-to-regexp-tests.ts

@@ -0,0 +1,16 @@
+/// <reference path='path-to-regexp.d.ts' />
+
+import pathToRegexp = require('path-to-regexp');
+
+var keys: string[] = [];
+var re = pathToRegexp('/foo/:bar', keys);
+
+re = pathToRegexp('/foo/:bar', keys, {
+    sensitive: true,
+    strict: false,
+    end: true
+});
+
+re = pathToRegexp('/foo/:bar', keys, {
+    sensitive: true
+});

path-to-regexp/path-to-regexp.d.ts

@@ -0,0 +1,20 @@
+// Type definitions for path-to-regexp v1.0.3
+// Project: https://github.com/pillarjs/path-to-regexp
+// Definitions by: xica <https://github.com/xica>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "path-to-regexp" {
+
+    function pathToRegexp(path: string, keys: string[], options?: pathToRegexp.Options): RegExp;
+
+    module pathToRegexp {
+
+        interface Options {
+            sensitive?: boolean;
+            strict?: boolean;
+            end?: boolean;
+        }
+    }
+
+    export = pathToRegexp;
+}