DATACMNS-507 - Prepare release 1.8 GA.

Update reference documentation for derived 'count' and 'delete' queries.

Original pull request: #83.

src/docbkx/repositories.xml

@@ -132,6 +132,31 @@
 
     <programlisting language="java">PagingAndSortingRepository&lt;User, Long&gt; repository = // … get access to a bean
 Page&lt;User&gt; users = repository.findAll(new PageRequest(1, 20));</programlisting>
+
+    <para>In addition to finder methods, query derivation for both count and
+    delete queries, is available.</para>
+
+    <example>
+      <title>Derived Count Query</title>
+
+      <programlisting language="java">public interface UserRepository extends CrudRepository&lt;User, Long&gt; {
+
+  Long countByLastname(String lastname);
+
+}</programlisting>
+    </example>
+
+    <example>
+      <title>Derived Delete Query</title>
+
+      <programlisting language="java">public interface UserRepository extends CrudRepository&lt;User, Long&gt; {
+
+  Long deleteByLastname(String lastname);
+  
+  List&lt;User&gt; removeByLastname(String lastname);
+
+}</programlisting>
+    </example>
   </section>
 
   <section id="repositories.query-methods">