Add changelog

CHANGELOG.adoc

+= Changelog
+
+All notable changes to this project will be documented in this file.
+This file should respect change log http://keepachangelog.com/[best practices].
+This project adheres to http://semver.org/[Semantic Versioning].
+
+== [Unreleased]
+
+=== Added
+
+* Implements Aegir and standard deployments as Fabric tasks
+* Allow database restoration
+* Simplify and group fabric commands into separate Python modules
+* Implements a more logical and readable set of commands
+
+=== Changed
+
+* Implements Drupalizer a Python module
+
+=== Deprecated
+
+* Almost every commands ... Run `fab --list` !