Upgrade versions (clojure: 1.5.1, clj-webdriver: 0.6.0)

Upgrade versions of Clojure and clj-webdriver

* Clojure: 1.5.0-RC6 -> 1.5.1
* clj-webdriver: 0.6.0-beta2 -> 0.6.0

And modify `.gitignore` a little.

Would you pull my changesets?