Update clojure to 1.5.1

Hi Sean,

I've had a go at upgrading cfmljure to use clojure 1.5.1 and org.clojure/java.jdbc 0.2.3.  I have also updated the README instructions for lein 2.

I had to modify the tests slightly as it appears that the return from sql/insert-record (which I note is deprecated but I wasn't sure what to use in its place?) is different to what it was in clj-sql.core.

Regards,
Andrew.