Add flake8 configuration file.

[Accidental merge] Add release notes for version 2.7.2

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

.flake8

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+[flake8]
+ignore = E501

docs/releases/2.7.2.rst

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+===============================
+Mayan EDMS v2.7.2 release notes
+===============================
+
+Released: September XX, 2017
+
+What's new
+==========
+
+- Fix new mailer creation view. GitLab issue #431.
+  Thanks to Robert Schöftner (@robert.schoeftner) for the
+  report and the solution.
+
+Removals
+--------
+* None
+
+Upgrading from a previous version
+---------------------------------
+
+Using PIP
+~~~~~~~~~
+
+Type in the console::
+
+    $ pip install -U mayan-edms
+
+the requirements will also be updated automatically.
+
+Using Git
+~~~~~~~~~
+
+If you installed Mayan EDMS by cloning the Git repository issue the commands::
+
+    $ git reset --hard HEAD
+    $ git pull
+
+otherwise download the compressed archived and uncompress it overriding the
+existing installation.
+
+Next upgrade/add the new requirements::
+
+    $ pip install --upgrade -r requirements.txt
+
+Common steps
+~~~~~~~~~~~~
+
+Migrate existing database schema with::
+
+    $ mayan-edms.py performupgrade
+
+Add new static media::
+
+    $ mayan-edms.py collectstatic --noinput
+
+The upgrade procedure is now complete.
+
+
+Backward incompatible changes
+=============================
+
+* None
+
+Bugs fixed or issues closed
+===========================
+
+* `GitLab issue #431 <https://gitlab.com/mayan-edms/mayan-edms/issues/431>`_ can't create new mailer
+
+.. _PyPI: https://pypi.python.org/pypi/mayan-edms/