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Python 3 print and basestring operations are slightly different.
The code should handle some of these now, however it does not handle
any of the unicode string changes.

Pylint was pointing out a number of bad things in the code, which may
now be addressed.

Add in the ability to perform CI testing, to make it easier to see when
something is broken.

The recent repr and merging code needs to be tested. The tests are
simple right now, but should catch most simple things.

The functions should be documented better.

The repr output now includes information about the executed command
and how it was invoked. Hopefully this will give more useful information
to us when things go wrong.

It is useful to have the command able to be given 'PIPE' as an explicit
argument, rather than having to use the subprocess one. This just saves
on importing an extra module, which this library was meant to be making
easier!

The subprocess 'CalledProcessException' does not record the args or
message. Consequently, when trying to debug what happened, it is
hard to see what actually happened. We modify the exception so that
the errors reported through it now include helpful messages.

The CalledProcessError exception was not following the usual pattern
of storing an 'args' and a 'message' to indicate what went wrong. We
patch the exception such that these two properties are supported.

On Windows, the tests fail badly because the commands in the tests
assume that there are certain commands present. We try to avoid that,
but there's still quite a bit broken.

We don't want to be dealing with CR LF issues.

In order that we can read out the output without UTF-8 conversion, we
add a 'binary' option. This would be required when the content was in a
different encoding, or was in fact just binary.

The longMessage attribute makes the results a lot more clear when
someting goes wrong.

We can improve the cross platform compatibility by using os.devnull
instead.

Works on OS X and Linux.