Removed dependencies from Github

[liebke]

By popular demand, I've removed incanter.jar and the jars in the lib
directory from Incanter's Github repository. A pre-built version of
Incanter that includes all the necessary dependencies can be
downloaded from http://cloud.github.com/downloads/liebke/incanter/incanter.zip.

I've also implemented a 'deps' ant task (stolen from Compojure's
build.xml) to download and install all the necessary dependencies.

The next step is to investigate using Maven.

David