util.pubsub: Add a node parameter to itemstore().
This allows the backend to know the node name, when it needs to
differentiate it at storage for example.
For full information on our dependencies, version requirements, and
where to find them, see http://prosody.im/doc/depends
If you have luarocks available on your platform, install the following:
- luaexpat
- luasocket
- luafilesystem
- luasec