tl;dr: added multi dice rolls, player rolls, and fixed the plugin.

It's been 5 years since I updated this plugin, but someone mentioned it wasn't working anymore, so I fixed it, and added a couple new features as well!
The main page is updated for commands and permissions, but the jist of it is that you can do /roll d20 5 to roll 5 d20s, and it will show you what each result was as well as the total.
You can also do /roll player to get a random player that is on the server.
Particles now work on version 1.9 and up, but won't break 1.8.8 if you try running it.
The dice you are allowed to use with /roll d# are in the config now, so you can add or remove whichever you'd like to remove.
You can also set the max number of dice that can be rolled at once, which can be bypassed with a permission node.
Everything is more efficient now, but it wasn't bad to begin with so it's probably not even noticeable.