ob-clojure: ':results pp' parses the output as a string value

[Phill Wolf <phill.wolf@gmail.com>]

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I am getting a strange effect from ":results pp" and ob-clojure.  "It\n
looks\n like\n this.\n"  I built Emacs 24.4.50 from trunk and cloned
ob-clojure from git today. clojure-mode is 20140331 from ELPA.  cider is
20140411 from ELPA.

Two examples follow.

 1. uses =:results pp= ("and\n looks\n like\n this\n")
 2. uses its own ~pprint~, and =:results output= (and looks correct)

I expected example 2's output from both 1 and 2.

Here's the data to pretty-print:

#+name: columnar-stuff
| State       | Bird              |
| New York    | Eastern Bluebird  |
| New Jersey  | Eastern Goldfinch |
| Connecticut | Penguin           |

Here is an attempt using =:results pp=:

#+begin_src clojure :exports both :results pp :var rows=columnar-stuff
rows
#+end_src

#+RESULTS:
: "((\"State\" \"Bird\")\n (\"New York\" \"Eastern Bluebird\")\n (\"New
Jersey\" \"Eastern Goldfinch\")\n (\"Connecticut\" \"Penguin\"))\n"

Here is a successful (but uglier) src block with an explicit ~pprint~,
and =:results output=:

#+begin_src clojure :exports both :results output :var rows=columnar-stuff
(clojure.pprint/pprint rows)
#+end_src

#+RESULTS:
: (("State" "Bird")
:  ("New York" "Eastern Bluebird")
:  ("New Jersey" "Eastern Goldfinch")
:  ("Connecticut" "Penguin"))

I would prefer =:results pp= to produce the same effect as the explicit
~pprint~, because keeping the ~pprint~ out of the published src block makes
the presentation clearer.

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