Ayrton

* _bg allows running a command in the background.
* _fails allows a Command to fail even when option('-e') is on.
* Try program_name as program-name if the first failed the path lookup.
* Convert all arguments to commands to str().
* chdir() is an alias of cd().
* Capture is a class, not an arbitrary value.
* Updated doc.
* Fixed globals and local passed to the execution of the script.
* Fixed some fd leakage.
* Fixed redirection when _out and _err where Capture.
* Fixed keyword handling while doing our black magic.
* More, better unit tests!

-- Marcos Dione <mdionegrulic.org.ar> Wed, 14 Jan 2015 21:58:28 +0100

* >= can redirect stederr to stdout.
* o(option=argument) can be used to declare keyword params among/before
positional ones.
* bash() now returns a single string if there is only one result.
* Slightly better error reporting: don't print a part of the stacktrace
that belongs to `ayrton` itself. There is still more to do.
* No longer depends on `sh`.

-- Marcos Dione <mdionegrulic.org.ar> Tue, 14 Jan 2014 21:35:13 +0100

* Piping and basic redirection works.

-- Marcos Dione <mdionegrulic.org.ar> Thu, 03 Oct 2013 20:42:12 +0200

* New function `options()` is similar to `bash`'s `set` command. So far
only the `errexit` and its short versions is accepted.
* The `ssh()` context manager was renamed to `remote()`. See NEWS.rst.
* New function `shitf()` similar to `bash`'s command of the same name.
See the docs.

-- Marcos Dione <mdionegrulic.org.ar> Sat, 14 Sep 2013 17:59:27 +0200

* RunninCommand.exit_code is a property, not a function. Closes 13.

-- Marcos Dione <mdionegrulic.org.ar> Wed, 11 Sep 2013 19:38:12 +0200

* The remote code (the body of a `with ssh (..): ...`) can be either pure
Python or ayrton. Pure Python imposes less dependencies on the remote.
* You can access the original `argv` in the remote.
* More documentation, more examples, even some that are useful!

-- Marcos Dione <mdionegrulic.org.ar> Wed, 11 Sep 2013 08:53:04 +0200