Log Message:
Add initial package for lua-keybinder, Lua bindings of keybinder.

The Keybinder package contains a library for registering global keyboard
shortcuts.
Keybinder works with GTK-based applications using the X Window System.

The library contains:
- A C library, libkeybinder
- Python bindings, python-keybinder
- An examples directory with programs in C, Lua, Python and Vala.

This package contains the Lua bindings.