luarocks spec file

consider including a spec file? Here's a simple one:

```
package = "lua-redis-parser"
version = "0.09-5"

description = {
    summary = "redis parser"
}

source = {
    url = "git://github.com/agentzh/lua-redis-parser.git",
    tag = "v0.09rc5"
}

build = {
    type = "builtin",
    modules = {
              ["redis.parser"] =  { "redis-parser.c" }
              }
}
```
