Simplify change of 41cc9eb: don't over-call SWANK on REPL calls.

* contrib/slime-repl.el (slime-repl-eval-string): simplify change of
2014-01-30; don't remotely call SWANK:SET-REPL-VARIABLES on
acknowledgement.

* contrib/swank-repl.lisp (set-repl-variables): Deleted.
(*repl-set-variables-function*): Deleted, not needed for now.
(repl-eval): Set *, + and / variables saved from last call just
before the EVAL-REGION that might use them.
Revert previous swank.asd change until proper ASDF support is built in.

See problems reported in #76 and and #83.

* swank.asd: revert previous change by 2014-01-05 Francois-Rene
Rideau until proper swank-loader-less ASDF support can be build
it. It exhibits problems on ABCL and SBCL.
Closes #101: don't use new Emacs 24.4's colon load-path in Makefile

* Makefile (LOAD_PATH): Closes #101: Don't use new : (colon)
feature of upcoming Emacs 24.4.
Upgrade to cl-lib 0.4 and remove some compilation warnings.

* slime.el: Prefix all cl-functions with "cl-".

* contrib/slime-repl.el: Prefix all cl-functions with "cl-"

* lib/cl-lib.el: Upgrade bundled version to 0.4.