Implementing a Bukkit API/Screenshot? Help!

Hello,

I am fairly new to Bukkit, and recently updated my server to Bukkit 1.3.1, however It doesn't run real well on my server. So, I went to a popular AUS server (MCAU), and did /version, here's what came up (Sorry about the chat in the backround):



Anyway, what I was wondering was how they did this, how did they Implement an API, different from the version of CraftBukkit. I want my CraftBukkit to be 1.2.5 R5.o, and the same API that they used. So, all in one, I need to know where to get the API and CraftBukkit build, how to make the API implement, and install both of them successfully. Remember, I am fairly new to Bukkit, so I don't know a lot of advanced Bukkit terms.

Thank you in advance,
Build_and_Break

 

They are running b2269 of CB, an early 1.3.1 dev build. http://dl.bukkit.org/downloads/craftbukkit/view/01265_1.3.1-R0.1/

If you are having trouble with the RB, downgrading to this dev build will not help you.