Added a simple lua driver.

  Linking to lua 5.1 we have lua.c which will read the named file
 and execute it.  The script should set the values "width" + "height",
 which are then accessible to C.

  This is a proof of concept tool which will be used to demonstrate
 setting a configuration value in LUA code, then reading it from
 C.

  We expect to use something like that for the sidebar setup, and
 the keyboard bindings.