add project files to the uberjar first, then dependencies

since duplicates are skipped, add the project files to the uberjar
first, so that they always win the war of the duplicates.  for
instance, MANIFEST.MF from clojure would previously have been added
before MANIFEST.MF from the project's jar, making :main not work.

src/leiningen/uberjar.clj

@@ -77,7 +77,7 @@ the dependency jars. Suitable for standalone distribution."
                              (ZipOutputStream.))]
            (let [deps (->> (.listFiles (file (:library-path project)))
                            (filter #(.endsWith (.getName %) ".jar")))
-                 jars (conj (vec deps) (file (get-jar-filename project)))]
+                 jars (cons (file (get-jar-filename project)) deps)]
              (write-components project jars out)))
          (println "Created" standalone-filename))
        (abort "Uberjar aborting because jar/compilation failed.")))