docs: add preliminary v2014.4 release notes

It's much nicer to fill in the release notes piece by piece as v2014.4 is
developed, so let's start with the new modular config mode.

docs/index.rst

@@ -79,6 +79,7 @@ Releases
 .. toctree::
    :maxdepth: 1
 
+   releases/v2014.4
    releases/v2014.3
 
 

docs/releases/v2014.4.rst

+Gluon 2014.4 (In development)
+=============================
+
+New hardware support
+~~~~~~~~~~~~~~~~~~~~
+
+New features
+~~~~~~~~~~~~
+
+Modular config mode
+-------------------
+
+Bugfixes
+~~~~~~~~
+
+Site changes
+~~~~~~~~~~~~
+* ``site.conf``
+
+* ``site.mk``
+
+  - Obsolete packages:
+
+    + ``gluon-config-mode``
+
+  - Recommended new packages:
+
+    + ``gluon-config-mode-autoupdater``
+    + ``gluon-config-mode-hostname``
+    + ``gluon-config-mode-mesh-vpn``
+    + ``gluon-config-mode-geo-location``
+    + ``gluon-config-mode-contact-info``
+
+Internals
+~~~~~~~~~