Ruby and Lua client language bindings for knxd

[ekarak]

Hello all,
these are the Ruby and Lua client language bindings, adapted from eibd to knxd. Please review them for merging.

[Makki1]

I merged it, but honestly I cannot tell or test, if they make sense myself.
So I'm asking the affected community (Ruby/LUA) to test..

[ekarak]

To whoever does testing: https://github.com/ekarak/ansible/blob/master/knx/knx_transceiver.rb
for a production example of the Ruby client. Methods of interest are:
init_eibd() for connecting to eibd/knxd
add_default_callback() for responding to read requests
knx2stomp_monitor() for handling monitor messages
send_apdu_raw() for sending raw APDU's to the bus

[Makki1]

Please leave these under /contrib/ruby/test (or whichever path you find useful) and I'll also merge it.
I really want to avoid dozens of projects for a single thing..