Add version 2.8 release notes.

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

docs/releases/2.8.rst

@@ -0,0 +1,84 @@
+=============================
+Mayan EDMS v2.8 release notes
+=============================
+
+Released: September XX, 2017
+
+What's new
+==========
+
+- Rename the role groups link label from "Members" to "Groups".
+- Rename the group users link label from "Members" to "Users".
+- Don't show full document version label in the heading of the document
+  version list view.
+- Show the number of pages of a document and of document versions in
+  the document list view and document versions list views respectively.
+- Display a document version's thumbnail before other attributes.
+- User Django's provided form for setting an users password.
+  This change allows displaying the current password policies
+  and validation.
+- Add method to modify a group's role membership from the group's
+  view.
+- Rename the group user count column label from "Members" to "Users".
+- Backport support for global and object event notification.
+  GitLab issue #262.
+- Remove Vagrant section of the document. Anything related to
+  Vagrant has been move into its own repository at:
+  https://gitlab.com/mayan-edms/mayan-edms-vagrant
+
+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 #262 <https://gitlab.com/mayan-edms/mayan-edms/issues/262>`_ Event notifications
+
+.. _PyPI: https://pypi.python.org/pypi/mayan-edms/