Updating the test builds to use Clojure 1.7-alpha2.

Author: krisajenkins

project.clj

@@ -16,7 +16,7 @@
                              [lein-expectations "0.0.7"]]}
              :1.5 {:dependencies [[org.clojure/clojure "1.5.1"]]}
              :1.6 {:dependencies [[org.clojure/clojure "1.6.0"]]}
-             :1.7 {:dependencies [[org.clojure/clojure "1.7.0-alpha1"]]}}
+             :1.7 {:dependencies [[org.clojure/clojure "1.7.0-alpha2"]]}}
   :core.typed {:check [yesql.annotations
                        yesql.util
                        yesql.instaparse-util