[enh][oscar_template] split js-files and compile them together

.travis.yml

@@ -5,6 +5,7 @@ before_install:
   - "export DISPLAY=:99.0"
   - "sh -e /etc/init.d/xvfb start"
   - npm install -g less
+  - cd searx/static/oscar;npm install
 install:
   - "make"
   - pip install coveralls
@@ -12,6 +13,7 @@ script:
   - "make tests"
   - "make robot"
   - "make styles"
+  - "make grunt"
   - make coverage
 after_success:
   coveralls