Adding a type definition for del

This is useful for people who want to write their gulpfile in
TypeScript.

del/del-tests.ts

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+/// <reference path="./del.d.ts"/>
+import del = require("del");
+
+var paths = ["build", "dist/**/*.js"];
+
+del(["tmp/*.js", "!tmp/unicorn.js"], (err, paths) => {
+    console.log('Deleted files/folders:\n', paths.join('\n'));
+});
+
+del(["tmp/*.js", "!tmp/unicorn.js"], {force: true}, (err, paths) => {
+    console.log('Deleted files/folders:\n', paths.join('\n'));
+});
+
+del("tmp/*.js", (err, paths) => {
+    console.log('Deleted files/folders:\n', paths.join('\n'));
+});
+
+del("tmp/*.js", {force: true}, (err, paths) => {
+    console.log('Deleted files/folders:\n', paths.join('\n'));
+});
+
+del.sync(["tmp/*.js", "!tmp/unicorn.js"]);
+
+del.sync(["tmp/*.js", "!tmp/unicorn.js"], {force: true});
+
+del.sync("tmp/*.js");
+
+del.sync("tmp/*.js", {force: true});

del/del.d.ts

@@ -0,0 +1,28 @@
+// Type definitions for del
+// Project: https://github.com/sindresorhus/del
+// Definitions by: Asana <https://asana.com>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../glob/glob.d.ts"/>
+
+declare module "del" {
+    import glob = require("glob");
+
+    function Del(pattern: string, callback: (err: Error, deletedFiles: string[]) => any): void;
+
+    function Del(pattern: string, options: Del.Options, callback: (err: Error, deletedFiles: string[]) => any): void;
+
+    function Del(patterns: string[], callback: (err: Error, deletedFiles: string[]) => any): void;
+
+    function Del(patterns: string[], options: Del.Options, callback: (err: Error, deletedFiles: string[]) => any): void;
+    module Del {
+        function sync(pattern: string, options?: Options): void;
+        function sync(patterns: string[], options?: Options): void;
+
+        interface Options extends glob.IOptions {
+            force?: boolean
+        }
+    }
+
+    export = Del;
+}