Move npm install to .travis.yml

Author: Emmanouil Konstantinidis

Diff for: .travis.yml

@@ -12,6 +12,7 @@ env:
   - DJANGO_VERSION=1.9
 
 install:
+  - npm install
   - pip install -r requirements.txt
   - pip install -U Django==$DJANGO_VERSION
   - pip install codecov

Diff for: runtests.py

@@ -25,7 +25,7 @@ def flake8_main(args):
 
 def run_tests_eslint():
     print('Running: eslint')
-    command = subprocess.call(['cd rest_framework_docs/static/ && npm install && npm test'], shell=True)
+    command = subprocess.call(['cd rest_framework_docs/static/ && npm test'], shell=True)
     print("" if command else "Success. eslint passed.")
     return command