Simplify test setup and set up travis CI.

No need to manually install xblock-sdk & dependencies anymore.
Inside a fresh virtual environment, run `sh install_test_deps.sh`,
then run the tests with `python run_tests.py`. That's it.

.travis.yml

+language: python
+python:
+    - "2.7"
+before_install:
+    - "export DISPLAY=:99"
+    - "sh -e /etc/init.d/xvfb start"
+install:
+    - "sh install_test_deps.sh"
+    - "python setup.py develop"
+script: pep8 poll --max-line-length=120 && pylint poll && python run_tests.py --with-coverage --cover-package=poll
+notifications:
+  email: false

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
+python setup.py develop

pylintrc

+[REPORTS]
+reports=no
+
+[FORMAT]
+max-line-length=120
+
+[MESSAGES CONTROL]
+disable=
+	abstract-class-not-used,
+	broad-except,
+	cyclic-import,
+	fixme,
+	invalid-name,
+	locally-disabled,
+	maybe-no-member,
+	missing-docstring,
+	protected-access,
+	star-args,
+	too-few-public-methods,
+	too-many-public-methods,
+	too-many-ancestors,
+	too-many-arguments,
+	too-many-locals,
+	unused-argument
+
+[SIMILARITIES]
+min-similarity-lines=8
\ No newline at end of file

run_tests.py

+#!/usr/bin/env python
+"""
+Run tests for the Poll XBlock
+
+This script is required to run our selenium tests inside the xblock-sdk workbench
+because the workbench SDK's settings file is not inside any python module.
+"""
+
+import os
+import sys
+import workbench
+
+if __name__ == "__main__":
+    # Find the location of the XBlock SDK. Note: it must be installed in development mode.
+    # ('python setup.py develop' or 'pip install -e')
+    xblock_sdk_dir = os.path.dirname(os.path.dirname(workbench.__file__))
+    sys.path.append(xblock_sdk_dir)
+
+    # Use the workbench settings file:
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "settings")
+    # Configure a range of ports in case the default port of 8081 is in use
+    os.environ.setdefault("DJANGO_LIVE_TEST_SERVER_ADDRESS", "localhost:8081-8099")
+
+    from django.core.management import execute_from_command_line
+    args = sys.argv[1:]
+    paths = [arg for arg in args if arg[0] != '-']
+    if not paths:
+        paths = ["tests/"]
+    options = [arg for arg in args if arg not in paths]
+    execute_from_command_line([sys.argv[0], "test"] + paths + options)

setup.py

@@ -53,6 +53,8 @@ setup(
         'XBlock',
         'markdown',
         'xblock-utils',
+        'ddt',
+        'mock',
     ],
     dependency_links=['http://github.com/edx-solutions/xblock-utils/tarball/master#egg=xblock-utils'],
     entry_points={