copy htmlimports-lite from webcomponentsjs and related tests

Author: valdrinkoshi

.gitignore

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+node_modules
+bower_components
+
+npm-debug.log*

gulpfile.js

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+/**
+ * @license
+ * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
+ * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+ * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+ * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+ * Code distributed by Google as part of the polymer project is also
+ * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+ */
+
+'use strict';
+
+const compilerPackage = require('google-closure-compiler');
+const gulp = require('gulp');
+const sourcemaps = require('gulp-sourcemaps');
+
+const closureCompiler = compilerPackage.gulp();
+
+gulp.task('default', () => {
+  return gulp.src('./src/html-imports.js', {base: './'})
+      .pipe(sourcemaps.init())
+      .pipe(closureCompiler({
+          compilation_level: 'ADVANCED',
+          warning_level: 'VERBOSE',
+          language_in: 'ECMASCRIPT6_STRICT',
+          language_out: 'ECMASCRIPT5_STRICT',
+          js_output_file: 'html-imports.min.js',
+          new_type_inf: true,
+          rewrite_polyfills: false,
+        }))
+      .pipe(sourcemaps.write('/'))
+      .pipe(gulp.dest('./'));
+});

html-imports.min.js

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+{
+  "name": "@webcomponents/html-imports",
+  "version": "0.0.1",
+  "description": "HTML Imports Polyfill",
+  "main": "html-imports.min.js",
+  "directories": {
+    "test": "tests"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/webcomponents/html-imports.git"
+  },
+  "author": "The Polymer Authors",
+  "license": "BSD-3-Clause",
+  "bugs": {
+    "url": "https://github.com/webcomponents/html-imports/issues"
+  },
+  "scripts": {
+    "build": "gulp",
+    "test": "wct"
+  },
+  "homepage": "http://webcomponents.org",
+  "devDependencies": {
+    "google-closure-compiler": "^20160822.1.0",
+    "gulp": "^3.8.8",
+    "gulp-sourcemaps": "^1.6.0",
+    "web-component-tester": "^4.0.1"
+  }
+}