Fix Travis build - xblock-sdk assumes a specific CWD & use Firefox 36

.travis.yml

@@ -11,4 +11,6 @@ install:
     - "pip install dist/xblock-drag-and-drop-v2-0.1.tar.gz"
 script: pep8 drag_and_drop_v2 --max-line-length=120 && python run_tests.py
 notifications:
-  email: false
+  email: false
\ No newline at end of file
+addons:
+  firefox: "36.0"

install_test_deps.sh

 # Installs xblock-sdk and dependencies needed to run the tests suite.
 # Run this script inside a fresh virtual environment.
 pip install -e git://github.com/edx/xblock-sdk.git#egg=xblock-sdk
-pip install -r $VIRTUAL_ENV/src/xblock-sdk/requirements.txt
-pip install -r $VIRTUAL_ENV/src/xblock-sdk/test-requirements.txt
+cd $VIRTUAL_ENV/src/xblock-sdk/ && pip install -r requirements.txt \
+                                && pip install -r test-requirements.txt && cd -
 python setup.py develop