Some quick how-to-dev instructions, maybe something to add to the wiki?

[yaleman]

1. Fork the repository by visiting https://github.com/projecthorus/sondehub-tracker/fork.
2. Clone the repository with your git tool of choice.
3. Run build.sh to compile the javascript files. (This requires Java to be installed and in your path.)
4. Run python serve.py to run a simple web server to (This requires python 3.x)
5. Visit http://localhost:8000 to view the local version of the server!