Fix potential path to babel issue

Fix potential issue when the ATOM_HOME path contains spaces.

Author: danielbayley

lib/grammars/javascript.js

@@ -5,7 +5,7 @@ import GrammarUtils from '../grammar-utils';
 
 const babel = path.join(__dirname, '../..', 'node_modules', '.bin', 'babel');
 
-const args = ({ filepath }) => ['-c', `${babel} --filename '${babel}' < '${filepath}'| node`];
+const args = ({ filepath }) => ['-c', `'${babel}' --filename '${babel}' < '${filepath}'| node`];
 
 exports.Dart = {
   'Selection Based': {