docs+build: Prepare release of version 0.4.0

Change-Id: Ibd3129da74afa24a35115789a517e562f0a12639
Refs: #3178
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+NFD version 0.3.3
+-----------------
+
+Release date: July 1, 2015
+
+Changes since version 0.3.2:
+
+New features:
+^^^^^^^^^^^^^
+
+- Content Store replacement policy interface (:issue:`1207`)
+
+- Add unit file and instructions for systemd (:issue:`1586`)
+
+- NDN Essential Tools version 0.1 `<https://github.com/named-data/ndn-tools>`__ featuring:
+
+  * ``ndnpeek``, ``ndnpoke``: a pair of programs to request and make available for retrieval of
+    a single Data packet
+  * ``ndnping``, ``ndnpingserver``: reachability testing tools for Named Data Networking
+  * ``ndndump``: a traffic analysis tool that captures Interest and Data packets on the wire
+  * ``ndn-dissect``: an NDN packet format inspector. It reads zero or more NDN packets from
+    either an input file or the standard input, and displays the Type-Length-Value (TLV)
+    structure of those packets on the standard output.
+
+Updates and bug fixes:
+^^^^^^^^^^^^^^^^^^^^^^
+
+- Avoid loopback new Interest in AccessStrategy (:issue:`2831`)
+
+- Simplified implementation of ``nfd-status`` using SegmentFetcher utility class (:issue:`2456`)
+
+Deprecated:
+^^^^^^^^^^^
+
+- ``ndn-tlv-peek`` and ``ndn-tlv-poke`` command-line tools: use ``ndnpeek`` and ``ndnpoke``
+  programs from NDN Essential Tools repository `<https://github.com/named-data/ndn-tools>`__.
+
+Upcoming features:
+^^^^^^^^^^^^^^^^^^
+
+- 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`)