Add django-oauth2-provider to .travis.yml

.travis.yml

@@ -14,6 +14,7 @@ env:
 install:
   - pip install $DJANGO
   - pip install defusedxml==0.3
+  - "pip install -e git+git://github.com/caffeinehit/django-oauth2-provider.git#egg=django-oauth2-provider"
   - "if [[ ${TRAVIS_PYTHON_VERSION::1} != '3' ]]; then pip install django-filter==0.5.4 --use-mirrors; fi"
   - "if [[ ${TRAVIS_PYTHON_VERSION::1} == '3' ]]; then pip install https://github.com/alex/django-filter/tarball/master; fi"
   - export PYTHONPATH=.