Adding a bunch of gulp utilities

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

gulp-typescript/gulp-typescript-tests.ts

@@ -0,0 +1,40 @@
+/// <reference path="./gulp-typescript.d.ts"/>
+/// <reference path="../gulp/gulp.d.ts"/>
+import gulp = require("gulp");
+import typescript = require("gulp-typescript");
+
+function merge(streams: NodeJS.ReadWriteStream[]): NodeJS.ReadWriteStream {
+    return null;
+}
+
+gulp.task('scripts', function() {
+    var tsResult = gulp.src('lib/*.ts')
+        .pipe(typescript({
+            declarationFiles: true,
+            noExternalResolve: true
+        }));
+
+    return merge([
+        tsResult.dts.pipe(gulp.dest('release/definitions')),
+        tsResult.js.pipe(gulp.dest('release/js'))]
+    );
+});
+
+
+var tsProject = typescript.createProject({
+    declarationFiles: true,
+    noExternalResolve: true
+});
+
+gulp.task('scripts', function() {
+    var tsResult = gulp.src('lib/*.ts')
+        .pipe(typescript(tsProject));
+
+    return merge([ // Merge the two output streams, so this task is finished when the IO of both operations are done.
+        tsResult.dts.pipe(gulp.dest('release/definitions')),
+        tsResult.js.pipe(gulp.dest('release/js'))]
+    );
+});
+gulp.task('watch', ['scripts'], function() {
+    gulp.watch('lib/*.ts', ['scripts']);
+});

gulp-typescript/gulp-typescript.d.ts

@@ -0,0 +1,38 @@
+// Type definitions for gulp-typescript
+// Project: https://github.com/ivogabe/gulp-typescript
+// Definitions by: Asana <https://asana.com>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts"/>
+
+declare module "gulp-typescript" {
+    function GulpTypescript(params: GulpTypescript.Params, filters?: GulpTypescript.FilterSettings): GulpTypescript.CompilationStream;
+
+    module GulpTypescript {
+        export function createProject(params: Params): Params;
+        export function filter(filters: FilterSettings): CompilationStream;
+        interface Params {
+            declarationFiles?: boolean;
+            module?: string;
+            noEmitOnError?: boolean;
+            noExternalResolve?: boolean;
+            noImplicitAny?: boolean;
+            noLib?: boolean;
+            removeComments?: boolean;
+            sourceRoot?: string;
+            sortOutput?: boolean;
+            target?: string;
+        }
+
+        interface FilterSettings {
+            referencedFrom?: string[];
+        }
+
+        interface CompilationStream extends NodeJS.ReadWriteStream {
+            dts: NodeJS.ReadWriteStream;
+            js: NodeJS.ReadWriteStream;
+        }
+    }
+
+    export = GulpTypescript;
+}