docs+build: Prepare release of version 0.4.0

Change-Id: Ibd3129da74afa24a35115789a517e562f0a12639
Refs: #3178
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+NFD version 0.3.4
+-----------------
+
+Release date: August 31, 2015
+
+Changes since version 0.3.3:
+
+New features:
+^^^^^^^^^^^^^
+
+- Boolean Face property IsOnDemand has been replaced with multistate FacePersistency
+  property (:issue:`2989`, :issue:`3018`): persistent (Face exists as long as there are no
+  system or socket errors), on-demand (Face is removed after inactivity period), and
+  permanent (Face exists unless explicitly destroyed by the management).
+
+  Currently, only UDP faces are allowed to be permanent.  However, management interface to
+  create UDP permanent faces or switch UDP to permanent state will be available in the
+  next release (:issue:`2991`).
+
+- Least Recently Used policy for Content Store (:issue:`2219`)
+
+  Currently, changing the policy requires a minor change in NFD source code.
+  Configuration interface is coming in the next release (:issue:`3148`)
+
+
+Updates and bug fixes:
+^^^^^^^^^^^^^^^^^^^^^^
+
+- Update of NDN Essential Tools to version 0.2 `<https://github.com/named-data/ndn-tools>`__
+  with code improvements and the following new tools:
+
+  * PIB service to manage the public information of keys and publish certificates
+    (:issue:`3018`)
+  * A Wireshark dissector for NDN packets (:issue:`3092`)
+
+- RibManager constructor now accepts KeyChain as a parameter, preparing it for simplifying
+  implementation with the new ``ndn::Dispatcher`` class (:issue:`2390`)
+
+- Fix HTML rendering of nfd-status-http-server output in some browsers (:issue:`3019`)
+
+- Enable automatic re-creation of multicast faces when network connectivity changes
+  (:issue:`2460`)
+
+- Enhance exception throwing with Boost Exception library (:issue:`2541`)
+
+Deprecated:
+^^^^^^^^^^^
+
+- BroadcastStrategy (``/localhost/nfd/strategy/broadcast``) renamed as MulticastStrategy
+  (``/localhost/nfd/strategy/multicast``) (:issue:`3011`)
+
+Upcoming features (partially finished in development branches):
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+- NDNLPv2 (http://redmine.named-data.net/projects/nfd/wiki/NDNLPv2, :issue:`2520`,
+  :issue:`2879`, :issue:`2763`, :issue:`2883`, :issue:`2841`, :issue:`2866`)
+
+- Refactored implementation of NFD management (:issue:`2200`, :issue:`2107`)