Adding a bunch of gulp utilities

This should allow a developer to write a gulpfile in TypeScript to
compile a TypeScript project.

gulp-rename/gulp-rename-tests.ts

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+/// <reference path="./gulp-rename.d.ts"/>
+/// <reference path="../gulp/gulp.d.ts"/>
+import gulp = require("gulp");
+import rename = require("gulp-rename");
+
+// rename via string
+gulp.src("./src/main/text/hello.txt")
+    .pipe(rename("main/text/ciao/goodbye.md"))
+    .pipe(gulp.dest("./dist")); // ./dist/main/text/ciao/goodbye.md
+
+// rename via function
+gulp.src("./src/**/hello.txt")
+    .pipe(rename((path) => {
+        path.dirname += "/ciao";
+        path.basename += "-goodbye";
+        path.extname = ".md"
+    }))
+    .pipe(gulp.dest("./dist")); // ./dist/main/text/ciao/hello-goodbye.md
+
+// rename via hash
+gulp.src("./src/main/text/hello.txt", { base: process.cwd() })
+    .pipe(rename({
+        dirname: "main/text/ciao",
+        basename: "aloha",
+        prefix: "bonjour-",
+        suffix: "-hola",
+        extname: ".md"
+    }))
+    .pipe(gulp.dest("./dist")); // ./dist/main/text/ciao/bonjour-aloha-hola.md

gulp-rename/gulp-rename.d.ts

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+// Type definitions for gulp-rename
+// Project: https://github.com/hparra/gulp-rename
+// Definitions by: Asana <https://asana.com>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts"/>
+
+declare module "gulp-rename" {
+    interface Options {
+        dirname?: string;
+        basename?: string;
+        prefix?: string;
+        suffix?: string;
+        extname?: string;
+    }
+    function rename(name: string): NodeJS.ReadWriteStream;
+    function rename(callback: (path: Options) => any): NodeJS.ReadWriteStream;
+    function rename(opts: Options): NodeJS.ReadWriteStream;
+    export = rename;
+}