Update test requirements to make integrations tests pass on Travis.

.travis.yml

@@ -6,6 +6,8 @@ before_install:
   - sh -e /etc/init.d/xvfb start
 install:
   - pip install -r 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 install -r $VIRTUAL_ENV/src/xblock/requirements.txt
 script:
   - pep8 --max-line-length=100 activetable

test-requirements.txt

 -r requirements.txt
 
-bok_choy==0.3.3
-coverage
+-e git+https://github.com/edx/xblock-sdk.git@629650ed6fc1b77d1a5287debeace0b29db7c0fd#egg=xblock-sdk
+
 ddt
-pep8
-pylint==1.3.1   # Same version as XBlock requires to avoid conflicting requirements
 selenium==2.48.0