On my machine, I have a plugin for Ant. It's called ant-contrib. It was easy to install. I just put the ant-contrib-0.3.jar in the lib folder of Ant. It lets me do some cool things with Ant, including if statements. Now, I want to run my build scripts using Bamboo. Currently my scripts fail because the version of Ant that bamboo uses does not have these capabilities. How do I install plugins like ant-contrib in bamboo?