API change for Lua sources

[Victor Toso <lists victortoso com>]

Hi all,

Morse's patches are in since yesterday [0] for the Lua-Factory plugin.
These patches address some design flaws in the glue code from C api to
Lua and also improve some of the helper functions in Lua-Library for the
Lua sources.

[0] https://bugzilla.gnome.org/show_bug.cgi?id=753141#c158

A summary of the changes are in this mail thread [1] but if you maintain
some Lua sources, you might be more interested in the diffs such as
grl-appletrailers [2] and grl-video-title-parsing [3].

[1] https://mail.gnome.org/archives/grilo-list/2015-October/msg00005.html
[2] https://git.gnome.org/browse/grilo-plugins/commit/?id=bea8e082da513d9
[3] https://git.gnome.org/browse/grilo-plugins/commit/?id=46b127a9ccee3a0

A proper documentation for Lua sources is overdue for so long that I
have enough shame to not look into dates :P. My plan was having the API
changes and the documentation together but I did not make it in time.

I'm preparing myself for a talk in Devconf next weekend about Grilo [4]
and I hope to have the documentation filled in BZ till then.

[4] https://devconfcz2016.sched.org/event/5m0m/grilo-framework-and-lua

If you ran into problems or have any questions, feel free to ask here or
in our IRC channel.

Kudos to Morse for this improvements!

Kind regards,
  toso