The project uses Leiningen 2 and does require Cassandra 2.0+ to be running locally.
Make sure you have Leiningen 2 installed and then run tests against all supported Clojure versions using
lein all do clean, javac, test
Then create a branch and make your changes on it. Once you are done with your changes and all tests pass, write a good, detailed commit message submit a pull request on GitHub.