Wire Gulp backend compilation tasks with the tool

This is to allow for calling, e.g., `# gulp backend`.

Author: bryk

build/conf.js

@@ -35,6 +35,8 @@ export default {
     app: path.join(basePath, 'src/app'),
     assets: path.join(basePath, 'src/app/assets'),
     base: basePath,
+    backendSrc: path.join(basePath, 'src/app/backend'),
+    backendTmp: path.join(basePath, '.tmp/backend'),
     bowerComponents: path.join(basePath, 'bower_components'),
     build: path.join(basePath, 'build'),
     dist: path.join(basePath, 'dist'),

gulpfile.babel.js

@@ -18,11 +18,13 @@
  *
  * Learn more at: http://gulpjs.com
  */
+import './build/backend';
 import './build/build';
 import './build/index';
 import './build/script';
 import './build/serve';
 import './build/style';
 import './build/test';
 
+
 // No business logic in this file.