{:user {:plugins [[lein-swank "1.4.5"]
[lein-pprint "1.1.1"]]}}
You can take out pprint but it is nice to have if you want to pretty print some data from your repl.
Then you can cd to the directory where you have project.clj and simply run:
- lein swank
- slime-connect (from within emacs)
Now, enjoy all the goodies of lein 2 and stay with your good old friend slime.