Trio-click

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(bugfix release, released on November 27th 2015)

- Resolved an issue with invisible progress bars no longer rendering.
- Disable chain commands with subcommands as they were inherently broken.
- Fix ``MissingParameter`` not working without parameters passed.

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(codename "pow pow", released on November 24th 2015)

- Optimized the progressbar rendering to not render when it did not
actually change.
- Explicitly disallow ``nargs=-1`` with a set default.
- The context is now closed before it's popped from the stack.
- Added support for short aliases for the false flag on toggles.
- Click will now attempt to aid you with debugging locale errors
better by listing with the help of the OS what locales are
available.
- Click used to return byte strings on Python 2 in some unit-testing
situations. This has been fixed to correctly return unicode strings
now.
- For Windows users on Python 2, Click will now handle Unicode more
correctly handle Unicode coming in from the system. This also has
the disappointing side effect that filenames will now be always
unicode by default in the ``Path`` type which means that this can
introduce small bugs for code not aware of this.
- Added a ``type`` parameter to ``Path`` to force a specific string type
on the value.
- For users running Python on Windows the ``echo`` and ``prompt`` functions
now work with full unicode functionality in the Python windows console
by emulating an output stream. This also applies to getting the
virtual output and input streams via ``click.get_text_stream(...)``.
- Unittests now always force a certain virtual terminal width.
- Added support for allowing dashes to indicate standard streams to the
``Path`` type.
- Multi commands in chain mode no longer propagate arguments left over
from parsing to the callbacks. It's also now disallowed through an
exception when optional arguments are attached to multi commands if chain
mode is enabled.
- Relaxed restriction that disallowed chained commands to have other
chained commands as child commands.
- Arguments with positive nargs can now have defaults implemented.
Previously this configuration would often result in slightly unexpected
values be returned.

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(bugfix release, released on 17th August 2015)

- Fix a bug in ``pass_obj`` that would accidentally pass the context too.

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(codename "tok tok", released on 16th August 2015)

- Removed various deprecated functionality.
- Atomic files now only accept the ``w`` mode.
- Change the usage part of help output for very long commands to wrap
their arguments onto the next line, indented by 4 spaces.
- Fix a bug where return code and error messages were incorrect when
using ``CliRunner``.
- added ``get_current_context``.
- added a ``meta`` dictionary to the context which is shared across the
linked list of contexts to allow click utilities to place state there.
- introduced ``Context.scope``.
- The ``echo`` function is now threadsafe: It calls the ``write`` method of the
underlying object only once.
- ``prompt(hide_input=True)`` now prints a newline on ``^C``.
- Click will now warn if users are using ``unicode_literals``.
- Click will now ignore the ``PAGER`` environment variable if it is empty or
contains only whitespace.
- The ``click-contrib`` GitHub organization was created.

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(bugfix release, released on July 14th 2015)

- Fix a bug where error messages would include a trailing ``None`` string.
- Fix a bug where Click would crash on docstrings with trailing newlines.
- Support streams with encoding set to ``None`` on Python 3 by barfing with
a better error.
- Handle ^C in less-pager properly.
- Handle return value of ``None`` from ``sys.getfilesystemencoding``
- Fix crash when writing to unicode files with ``click.echo``.
- Fix type inference with multiple options.

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(codename "zoom zoom", released on March 31st 2015)

- Added ``color`` parameters to lots of interfaces that directly or indirectly
call into echoing. This previously was always autodetection (with the
exception of the ``echo_via_pager`` function). Now you can forcefully
enable or disable it, overriding the auto detection of Click.
- Added an ``UNPROCESSED`` type which does not perform any type changes which
simplifies text handling on 2.x / 3.x in some special advanced usecases.
- Added ``NoSuchOption`` and ``BadOptionUsage`` exceptions for more generic
handling of errors.
- Added support for handling of unprocessed options which can be useful in
situations where arguments are forwarded to underlying tools.
- Added ``max_content_width`` parameter to the context which can be used to
change the maximum width of help output. By default Click will not format
content for more than 80 characters width.
- Added support for writing prompts to stderr.
- Fix a bug when showing the default for multiple arguments.
- Added support for custom subclasses to ``option`` and ``argument``.
- Fix bug in ``clear()`` on Windows when colorama is installed.
- Reject ``nargs=-1`` for options properly. Options cannot be variadic.
- Fixed an issue with bash completion not working properly for commands with
non ASCII characters or dashes.
- Added a way to manually update the progressbar.
- Changed the formatting of missing arguments. Previously the internal
argument name was shown in error messages, now the metavar is shown if
passed. In case an automated metavar is selected, it's stripped of
extra formatting first.