Add definitions and tests for gulp-flatten

gulp-flatten/gulp-flatten-tests.ts

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+/// <reference path="./gulp-flatten.d.ts" />
+/// <reference path="../gulp/gulp.d.ts" />
+
+import gulp = require("gulp");
+import flatten = require("gulp-flatten");
+
+gulp.task("flatten:simple", () => {
+    gulp.src(["files/**/*.txt"])
+        .pipe(flatten())
+        .pipe(gulp.dest("build"));
+});
+
+gulp.task("flatten:newPath", () => {
+    gulp.src(["files/**/*.txt"])
+        .pipe(flatten({ newPath: "new/path" }))
+        .pipe(gulp.dest("build"));
+});

gulp-flatten/gulp-flatten.d.ts

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+// Type definitions for gulp-flatten
+// Project: https://github.com/armed/gulp-flatten
+// Definitions by: Keita Kagurazaka <https://github.com/k-kagurazaka>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module "gulp-flatten" {
+
+    interface IOptions {
+        newPath: string;
+    }
+
+    function flatten(options?: IOptions): NodeJS.ReadWriteStream;
+
+    export = flatten;
+}