Change clojure class called by `storm repl`

Currently using `storm repl` there's a message saying that the `clojure.lang.Repl` class is deprecated.

```
WARNING: clojure.lang.Repl is deprecated.
Instead, use clojure.main like this:
java -cp clojure.jar clojure.main -i init.clj -r args...
Clojure 1.5.1
```

This change merely take the suggestion of the output, and updates the class to `clojure.main`.

https://issues.apache.org/jira/browse/STORM-504