Refactor + add more tests (Part 2) (#854)

* Refactor doc in server.js & generate.js

* Refactor finding metadata with find() & avoid param reassign

* Refactor replacing markdown link to html + add test

* Minify func to getFile & add test

* use ./ for md link as well

* nits & better test

* better mdToHtmlify

* babel-register on versions & write-translations to transpile ES6 in server/env.js

* better docs test & move out metadata to fixtures

* Update .babelrc

lib/version.js

@@ -7,6 +7,17 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+require('babel-register')({
+  babelrc: false,
+  only: [__dirname, `${process.cwd()}/core`],
+  plugins: [
+    require('./server/translate-plugin.js'),
+    'transform-class-properties',
+    'transform-object-rest-spread',
+  ],
+  presets: ['react', 'env'],
+});
+
 const program = require('commander');
 const chalk = require('chalk');
 const glob = require('glob');