Enable evil-paredit in cider-repl and move cljr-update-artifact-cache

After the recent changes to how cider initialises the repl turning on
evil-paredit doesn't cause the init to fail anymore.

These same changes caused the call to cljr-update-artifact-cache to fail
when called as part of the cider-repl-mode-hook, but it works when part of
the nrepl-connected-mode-hook.
Remove change which is now part of upstream