fix ordering of revisions in call to git-diff

Author: Lennon Day-Reynolds

lib/scm/adapters/git/patch.rb

@@ -1,8 +1,8 @@
 module Scm::Adapters
   class GitAdapter < AbstractAdapter
     def patch_for_commit(commit)
-      parents_tokens(commit).map {|token|
-        run("cd #{url} && git diff #{commit.token} #{token}")
+      parent_tokens(commit).map {|token|
+        run("cd #{url} && git diff #{token} #{commit.token}")
       }.join("\n")
     end
   end