Add node, gulp and travis build steps

.travis.yml

@@ -9,6 +9,8 @@ before_install:
 install:
   - pip install -r requirements.txt
   - pip install coveralls codeclimate-test-reporter
+  - npm install
+  - npm build
 
 before_script:
   - python manage.py collectstatic --noinput

gulpfile.js

@@ -65,3 +65,7 @@ gulp.task('frontend', [
     // 'css',
     'js_lib'
 ]);
+
+gulp.task('build', [
+    "frontend"
+]);

package.json

@@ -16,5 +16,8 @@
     "gulp-sourcemaps": "^2.6.0",
     "gulp-watch": "^4.3.11",
     "jquery": "^1.9.1"
+  },
+  "scripts": {
+    "build": "gulp build"
   }
 }