add Lua programming wikibook - close #1519

free-programming-books.md

@@ -1290,6 +1290,7 @@ See also [TeX](#tex)
 * [Lua 5.1 Reference Manual](http://www.lua.org/manual/5.1/)
 * [Programming In Lua](http://www.lua.org/pil/) (for version 5)
 * [Programming Gems](http://www.lua.org/gems/)
+* [Wikibook](http://en.wikibooks.org/wiki/Lua_Programming)
 
 
 ### Markdown