Titlebars default modification destroys your settings.

[raven2cz]

I found the problem after first usage that your titlebars are not used.
Because in standard configuration rc.lua is modification of titlebars which delete your titlebars and settings:
For example:
client.connect_signal("request::titlebars", function(c)
this configuration change your modification.
Please add to your installation notes, that the changes of titlebars in lua code has to be commented/not used. Because your settings replace these modifications.
In any cases, nice works for NICE! Thanks!

[mut-ex]

Thank you! I updated the README instructions to reflect that. :)