ARROW-2203: [C++] StderrStream class
ARROW-2203: [C++] StderrStream class

Output stream that just writes to stderr. Adapted from StdoutStream, but use `cerr` instead of `cout`.

Author: rvernica <rvernica@gmail.com>

Closes #1657 from rvernica/patch-1 and squashes the following commits:

535dd25 <rvernica> Fix lint issue - trim whitespace
4aa45b0 <rvernica> ARROW-2203:  StderrStream class

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