Enable source and javadoc attachment as part of the deploy process.

pom.xml

@@ -64,11 +64,21 @@
             <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
         </repository>
     </distributionManagement>
+
+    <pluginRepositories>
+        <pluginRepository>
+            <id>jcenter</id>
+            <name>JCenter</name>
+            <url>https://jcenter.bintray.com/</url>
+        </pluginRepository>
+    </pluginRepositories>
+
     <build>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-gpg-plugin</artifactId>
+                <version>1.6</version>
                 <executions>
                     <execution>
                         <id>sign-artifacts</id>
@@ -85,6 +95,30 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-source-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>attach-sources</id>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.jetbrains.dokka</groupId>
+                <artifactId>dokka-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>prepare-package</phase>
+                        <goals>
+                            <goal>javadocJar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>