Looks for main.lua. Launch it like this:
luajit myapp/lib/luigi/launch.lua
If luigi isn't inside the project directory, pass
the path containing main.lua as the second argument.
The path must end with a directory separator.
luajit /opt/luigi/launch.lua ./myapp/
If the app prefixes luigi modules with something
other then 'luigi', pass that prefix as the third
argument.
luajit /opt/luigi/launch.lua ./myapp/ lib.luigi
