add changelog and release note for 2.5.4

CHANGELOG

+## Centreon 2.5.4
+
+Bug fixes
+=========
+#5458: Display problem with host groups
+#5924: Generation of service configuration files does not work when "service_inherit_contacts_from_host" is not enabled
+#5926: Centreon-Broker-2.7.x compatibility
+#5929: Fix problem in import service groups by cfg file
+#5942: Fix compatibility with IE
+#5946: Problem in reporting due to acknowledgement
+#5986: Session's Id does not change after logout
+
+Features
+========
+#5433: Argument column larger in service configuration
+#5944: Services inherit criticality from hosts
+
 ## Centreon 2.5.3
 
 Bug fixes

doc/en/release_notes/centreon-2.5.4.rst

+==============
+Centreon 2.5.4
+==============
+
+
+******
+Notice
+******
+If you are upgrading from a version prior to 2.5.3, make sure to go through all the release notes available
+`here <http://documentation.centreon.com/docs/centreon/en/latest/release_notes/index.html>`_.
+
+*********
+CHANGELOG
+*********
+
+Bug fixes
+=========
+#5458: Display problem with host groups
+#5924: Generation of service configuration files does not work when "service_inherit_contacts_from_host" is not enabled
+#5926: Centreon-Broker-2.7.x compatibility
+#5929: Fix problem in import service groups by cfg file
+#5942: Fix compatibility with IE
+#5946: Problem in reporting due to acknowledgement
+#5986: Session's Id does not change after logout
+
+Features
+========
+#5433: Argument column larger in service configuration
+#5944: Services inherit criticality from hosts