Fix Travis build

.travis.yml

@@ -5,12 +5,13 @@ before_install:
     - "export DISPLAY=:99"
     - "sh -e /etc/init.d/xvfb start"
 install:
-    - "pip install -e git://github.com/edx/xblock-sdk.git#egg=xblock-sdk"
+    - "pip install -e git://github.com/edx/xblock-sdk.git@22c1b2f173919bef22f2d9d9295ec5396d02dffd#egg=xblock-sdk"
     - "pip install -r requirements.txt"
-    - "pip install -r $VIRTUAL_ENV/src/xblock-sdk/requirements.txt"
-    - "pip install -r $VIRTUAL_ENV/src/xblock-sdk/test-requirements.txt"
+    - "pip install -r $VIRTUAL_ENV/src/xblock-sdk/requirements/base.txt"
+    - "pip install -r $VIRTUAL_ENV/src/xblock-sdk/requirements/test.txt"
     - "pip uninstall -y xblock-problem-builder && python setup.py sdist && pip install dist/xblock-problem-builder-2.0.tar.gz"
     - "pip install -r test_requirements.txt"
+    - "mkdir var"
 script:
     - pep8 problem_builder --max-line-length=120
     - pylint problem_builder --disable=all --enable=function-redefined,undefined-variable,unused-variable