Move :checkout-deps-shares to default profile.

This will prevent checkout deps from being used when just the
production profile is active. Also, this may be the first legitimate
use of flatten I've ever seen.

leiningen-core/src/leiningen/core/classpath.clj

@@ -24,11 +24,7 @@
        "as it does not contain a project.clj file."))))
 
 (defn- checkout-dep-paths [project dep dep-project]
-  (if-let [shares (:checkout-deps-shares project)]
-    (map #(% dep-project) shares)
-    (concat (:source-paths dep-project)
-            (:resource-paths dep-project)
-            [(:compile-path dep-project)])))
+  (flatten (map dep-project shares)))
 
 (defn- checkout-deps-paths
   "Checkout dependencies are used to place source for a dependency

leiningen-core/src/leiningen/core/project.clj

@@ -122,7 +122,11 @@
   "Profiles get merged into the project map. The :dev and :user
   profiles are active by default."
   (atom {:default {:resource-paths ["dev-resources"]
-                   :plugins [['lein-newnew "0.3.1"]]}
+                   :plugins [['lein-newnew "0.3.1"]]
+                   :checkout-deps-shares [:source-paths
+                                          :resource-paths
+                                          :compile-path]}
+         :production {}
          :test {}
          :update {:update :always}
          :offline {:offline? true}