minor #262 Fixing bug where unnecessary files were being published to npm (weaverryan)

This PR was squashed before being merged into the master branch (closes #262).

Discussion
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Fixing bug where unnecessary files were being published to npm

Fixes #261

Webpack uses the `files` key, so we should too. It also means we don't need to try to maintain duplicate `.gitignore` and `.npmignore` files with the same contents.

I've verified that the following files will be included in the package (+ all of `lib/` and `bin/`):

<img width="422" alt="screen shot 2018-02-11 at 7 26 37 am" src="https://user-images.githubusercontent.com/121003/36073351-2b58ec26-0efd-11e8-91a3-ae627a7f33db.png">

Commits
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dae5836 Fixing bug where unnecessary files were being published to npm

Author: weaverryan

.eslintrc.js

@@ -57,4 +57,3 @@ module.exports = {
         "header/header": [2, "block", {"pattern": "This file is part of the Symfony Webpack Encore package"}]
     }
 };
-

.npmignore

@@ -81,5 +81,10 @@
     "vue-template-compiler": "^2.3.4",
     "webpack-notifier": "^1.5.0",
     "zombie": "^5.0.5"
-  }
+  },
+  "files": [
+    "lib/",
+    "bin/",
+    "index.js"
+  ]
 }

package.json

@@ -13,7 +13,7 @@ const chai = require('chai');
 chai.use(require('chai-fs'));
 const expect = chai.expect;
 const path = require('path');
-const testSetup = require('../../lib/test/setup');
+const testSetup = require('../helpers/setup');
 const fs = require('fs-extra');
 const exec = require('child_process').exec;
 

test/bin/encore.js

@@ -11,7 +11,7 @@
 
 const expect = require('chai').expect;
 const parseArgv = require('../../lib/config/parse-runtime');
-const testSetup = require('../../lib/test/setup');
+const testSetup = require('../helpers/setup');
 const fs = require('fs-extra');
 const path = require('path');
 

test/config/parse-runtime.js

@@ -13,7 +13,7 @@ const chai = require('chai');
 chai.use(require('chai-fs'));
 const expect = chai.expect;
 const path = require('path');
-const testSetup = require('../lib/test/setup');
+const testSetup = require('./helpers/setup');
 const fs = require('fs-extra');
 
 function createWebpackConfig(outputDirName = '', command, argv = {}) {

test/functional.js

@@ -10,14 +10,14 @@
 'use strict';
 
 const path = require('path');
-const WebpackConfig = require('../WebpackConfig');
-const parseRuntime = require('../config/parse-runtime');
+const WebpackConfig = require('../../lib/WebpackConfig');
+const parseRuntime = require('../../lib/config/parse-runtime');
 const webpack = require('webpack');
 const fs = require('fs-extra');
 const Browser = require('zombie');
 const httpServer = require('http-server');
-const configGenerator = require('../config-generator');
-const validator = require('../config/validator');
+const configGenerator = require('../../lib/config-generator');
+const validator = require('../../lib/config/validator');
 const assertUtil = require('./assert');
 
 const tmpDir = path.join(__dirname, '../', '../', 'test_tmp');