Installed with luarocks, no `lcrypt.hash` or `lcrypt.key`

```
sbizna ~$ lua -llcrypt
Lua 5.2.3  Copyright (C) 1994-2013 Lua.org, PUC-Rio
> = lcrypt.key
nil
> = lcrypt.hash
nil
```

As a result, test.lua does not run:

```
sbizna ~$ lua /tmp/test.lua 
lua: /tmp/test.lua:5: attempt to call field 'key' (a nil value)
stack traceback:
        /tmp/test.lua:5: in main chunk
        [C]: in ?
```
