Add javadocs for central release

Author: dsyer

Diff for: pom.xml

@@ -187,6 +187,18 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <artifactId>maven-javadoc-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>javadoc</id>
+            <phase>package</phase>
+            <goals>
+              <goal>jar</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>animal-sniffer-maven-plugin</artifactId>