Improve yaksh script

[prabhuramachandran]

Currently it seems you can only have one demo instance to play with. Instead of writing the NAME and PATH to the project_details.py it should either write a config file, or expect an additional argument to the path which should be used as the directory with the NAME as the basename of the dir.

The cli.py also does not satisfy PEP 8 and has other issues such as:

1. It does not pass any additional command line args to run_code_server.
2. The demo_settings.py seem to use an older django version. This should be updated.