Add definitions and tests for gulp-less

gulp-less/gulp-less-tests.ts

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+/// <reference path="./gulp-less.d.ts" />
+/// <reference path="../gulp/gulp.d.ts" />
+
+import gulp = require("gulp");
+import less = require("gulp-less");
+
+gulp.task("less", () => {
+    gulp.src("less/**/*.less")
+        .pipe(less({
+            paths: ["less/includes"]
+        }))
+        .pipe(gulp.dest("public/css"));
+});

gulp-less/gulp-less.d.ts

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+// Type definitions for gulp-less
+// Project: https://github.com/plus3network/gulp-less
+// Definitions by: Keita Kagurazaka <https://github.com/k-kagurazaka>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module "gulp-less" {
+
+    interface IOptions {
+        paths: string[];
+        plugins?: any[];
+    }
+
+    function less(options?: IOptions): NodeJS.ReadWriteStream;
+
+    export = less;
+}