Re-ver

====================

**Added:**

* New ``'authors'`` activitiy for keeping an author listing and mailmap files
up-to-date.
* New ``rever.authors`` module for managing author metadata and writing
mailmap files.
* New version control (``rever.vcsutils``) functions:

* ``commits_per_author()``
* ``commits_per_email()``
* ``first_commit_per_email()``
* New ``$RELEASE_DATE`` environment variable has been added, which is a
``datetime.date`` object. This defaults to the current date when
rever is executed.
* New ``rever.authors.load_metadata()`` function for loading author
metadata.

**Changed:**

* The changelog activity now is now more custmizable, allowing for user-specified
categories, custom formatting of the category titles, and the ability to append
authors for the current release.
* A newline between categories in merged news has been removed, reducing
the whitespace from two blank lines to one.

**Fixed:**

* Fixed the ``--force`` command line option to rerun on activities
and setup.
* Removed string escape warnings

**Authors:**

* Anthony Scopatz
* Christopher J. Wright

====================

**Added:**

* New ``rever.conda.env_exists()`` function for testing if a conda environment exists.
* ``$PUSH_TAG_PROTOCOL`` for manually specifying the push protocol.


**Changed:**

* ``PushTag`` now inspects remotes to find the correct protocol


**Fixed:**

* Fixed issue with ``docker_build`` activitiy not correctly setting the build
context when the Dockerfile is in the current directory.

====================

**Changed:**

* Updated rever to use ``xonsh.main.setup()`` function for initialization.


**Fixed:**

* Make ``git push`` and ``git push --tags`` respect the rever ``-f,--force``
command line argument.

====================

**Added:**

* New ``docker_build`` and ``docker_push`` activity for building
and pushing up Dockerfiles.

====================

**Added:**

* ``conda_forge`` activity kwarg for forking to an org


**Changed:**

* Conda in a docker container will now update dependencies, too.
* Now the ``news`` template uses ``* <news item>`` instead of ``None`` for
empty news categories.
* Use the tarball rever generates for the conda forge URL


**Deprecated:**

* ``None`` in the news template (still supported though)


**Fixed:**

* Use the actual ``$VERSION`` not the string ``'$VERSION'``
* Fixed ``rever.tools.hash_url()`` and ``rever.tools.stream_url_progress()``
functions to robustly handle FTP URLs, in addition to HTTP ones.
* ``repo.create_fork`` doesn't need a username
* Fixed bug preventing ``rever`` from running where version key is not
present in history entry.

====================

**Added:**

* GitHub Releases may now attach assets (extra files) to the release.


**Fixed:**

* Fix ``$TAG_TEMPLATE`` being ignored by conda_forge activity when defining
package URL on GitHub