Fix/update tutorial

[AlexP11223]

I was following the tutorial recently and found some issues:

1. load_demo.py takes username and password from args, not from config file. python load_demo.py 5432 postgres pgpassword
2. It probably should mention that Python dependencies have to be installed via pip. (pip install -r tools/requirements.txt)
3. frontend.sh didn't work for some reason, java was complaining that it cannot find MacroBaseServer. I didn't figure out why (even tried different OS, Ubuntu and Windows). So I opened the project in IDE and run the class from there.
4. There are some formatting issues. I guess it was supposed to be a numbered list:

[phildionne]

Same problem here, failing to execute frontend.sh with message:

Error: Could not find or load main class macrobase.runtime.MacroBaseServer
Caused by: java.lang.NoClassDefFoundError: io/dropwizard/Application