Remove deprecated sudo in example
Improve server-side log messages

- Prefix log messages with the address and port of the babeld client
- Do not repeat "socket closed" messages
Display RTT times of neighbours
Static hostname configuration for router ids
Move configuration directives to js/site-local.js
Workaround Heisenbug
Document js/site-local.js
Update doc for 0.4.0
Update package.json to 0.4.0
Release babelweb-0.4.0