Make runserver.py executable from /scripts directory

[fakhrizulkifli]

This is a small changes to make sure the user can execute the server directly from where it is located (/scripts directory).

[llazzaro]

This will break scripts after the project is installed.
Have you installed the project with setup.py? After installation you will have the "runserver" command available.
If you still want to execute inside scripts directory add to PYTHONPATH the root directory of the project.
With the pull request changes it will only work from the scripts directory only and it wil break all installations.
You can install multiav using pip + git with:
pip install git+https://github.com/joxeankoret/multiav.git
and then execute runserver from any directory.

Hope ti helps