Add definitions for gulp-htmlmin (https://github.com/jonschlinkert/gulp-htmlmin)

gulp-htmlmin/gulp-htmlmin.d.ts

@@ -0,0 +1,18 @@
+// Type definitions for gulp-htmlmin v1.3.0
+// Project: https://github.com/jonschlinkert/gulp-htmlmin
+// Definitions by: Tanguy Krotoff <https://github.com/tkrotoff>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+/// <reference path="../html-minifier/html-minifier.d.ts" />
+
+declare module 'gulp-htmlmin' {
+    import * as HTMLMinifier from 'html-minifier';
+
+    namespace htmlmin {
+    }
+
+    function htmlmin(options?: HTMLMinifier.Options): NodeJS.ReadWriteStream;
+
+    export = htmlmin;
+}