c.c.io provides input-stream and output-stream for byte-oriented I/O

clojure.contrib.io already supports character-oriented I/O through the
multi-methods reader and writer.  This patch adds support for
byte-oriented I/O by providing the multi-methods input-stream and
output-stream.

* input-stream knows how to open InputStreams for reading bytes.
* reader has been refactored to build on input-stream.

* output-stream knows how to open OutputStreams for writing bytes.
* writer has been refactored to build on output-stream (where sensible)

  By recognizing that output-stream will throw exceptions for us if it's
  unable to open the underlying resource, we were able to use the
  :default method to cover URL, URI and Socket.

  The String writer has not been touched. (Writing it in terms of
  output-stream would have made it longer and more complex.)

* *append-to-writer* has been renamed to *append* for use with
  output-streams without souding foolish.

  This is a breaking change for clients that bind *append-to-writer*
  instead of calling append-writer or append-split as recommended in
  the docsting.

* Like writer, output-stream consults the current binding of *append*.

* append-output-stream is analagous to append-writer.

  Like append-writer, the implementation looks very general, but in
  reality it only works for files.

Signed-off-by: Stuart Halloway <stu@thinkrelevance.com>

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