Use done status to mark end of message seq

[Yuhta]

Seem done marks the end of a message seq: https://github.com/clojure/tools.nrepl/blob/master/src/main/clojure/clojure/tools/nrepl.clj#L86.

Currently if the response contains eval-error there will be some messages (the exception message and the done) not appended to the buffer. Please advice if there is special reason why that code was commented out.