Rename en_US to sources

The reason this directory exists is because we need to copy it into
$builddir so we can combine it with generated sources (we can't pass
multiple source paths into publican).

So instead of having en_US, renamed to en-US stop the confusion and rename
the sources to "sources". That gets copied to en-US which will then contain
the actual output.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

doc/Wayland/sources/Book_Info.xml

@@ -0,0 +1,39 @@
+<?xml version='1.0' encoding='utf-8' ?>
+<!DOCTYPE bookinfo PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+<!ENTITY % BOOK_ENTITIES SYSTEM "Wayland.ent">
+%BOOK_ENTITIES;
+]>
+<bookinfo id="book-Wayland-Wayland">
+  <title>Wayland</title>
+  <subtitle>The Wayland display server</subtitle>
+  <productname>Documentation</productname>
+  <productnumber>0.1</productnumber>
+  <edition>1</edition>
+  <pubsnumber>0</pubsnumber>
+  <abstract>
+    <para>
+      Wayland is a protocol for a compositor to talk to
+      its clients as well as a C library implementation of
+      that protocol. The compositor can be a standalone
+      display server running on Linux kernel modesetting
+      and evdev input devices, an X application, or a
+      wayland client itself. The clients can be
+      traditional applications, X servers (rootless or
+      fullscreen) or other display servers.
+    </para>
+  </abstract>
+  <corpauthor>
+    <inlinemediaobject>
+      <imageobject>
+	<imagedata fileref="images/wayland.png" format="PNG" />
+      </imageobject>
+      <textobject>
+        <phrase>
+          Wayland logo
+        </phrase>
+      </textobject>
+    </inlinemediaobject>
+  </corpauthor>
+  <xi:include href="Common_Content/Legal_Notice.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
+  <xi:include href="Author_Group.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
+</bookinfo>