allows:
net.listen(ip, port)
net.close(ip, port)
net.list() =>
  { addr = { port = int, udp = bool, tcp = bool }, … }

this makes some services append-only, so the configuration
can look like:

modules = {
   cache = ‘’,
   hints = true,
}

without wiping previously-set modules

ifaces = net.interfaces()
print(ifaces.eth0.addr[0])
print(ifaces.eth0.mac)

lists available interfaces

example:
modules.hints = ‘{“input”:”/etc/hosts”}’
.. is equal to ..
modules.load(‘hints’)
hints.config(‘{“input”:”/etc/hosts”}’)

interface split to ‘map’ and ‘set’
added documentation
array: added array_tail() operation

The engine is responsible for central managemento of resources and work
distribution. This allows to spawn multiple loops.

The engine configuration / interface is based on Lua 5.1-5.2, including
a RPC and a simple CLI interface. This is going to be the core of configuration
later on.

the build system now doesn't always relink targets

refs #7