Fix config import

[sharmaeklavya2]

When I execute python server/manage.py runserver 8080 or python server/manage.py loaddata dev_utils/graph_data.json, I get this error:

Traceback (most recent call last):
  File "server/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/mnt/code/repos/cloned/metacademy/meta_venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/mnt/code/repos/cloned/metacademy/meta_venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 303, in execute
    settings.INSTALLED_APPS
  File "/mnt/code/repos/cloned/metacademy/meta_venv/lib/python2.7/site-packages/django/conf/__init__.py", line 48, in __getattr__
    self._setup(name)
  File "/mnt/code/repos/cloned/metacademy/meta_venv/lib/python2.7/site-packages/django/conf/__init__.py", line 44, in _setup
    self._wrapped = Settings(settings_module)
  File "/mnt/code/repos/cloned/metacademy/meta_venv/lib/python2.7/site-packages/django/conf/__init__.py", line 92, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/mnt/code/repos/cloned/metacademy/metacademy-application/server/settings.py", line 8, in <module>
    import config
ImportError: No module named config

I saw a similar error message in #66.

This pull request fixes this error by adding the root directory of this repository to sys.path.

[cjrd]

great - thanks!