Build source JARs

Modified module POMs to build source JARs alongside the usual artifacts.
Doing so is required by Sonatype when making releases in central.

Author: dmaccormack

module/core/pom.xml

@@ -43,4 +43,13 @@
 	You likely wont depend on this directly unless you're implementing
 	JSON->URL with a new interface/library/framework.
   </description>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+      </plugin>
+    </plugins>
+  </build>
 </project>

module/jsonorg/pom.xml

@@ -61,4 +61,13 @@
       <version>${org.json.parser}</version>
     </dependency>
   </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+      </plugin>
+    </plugins>
+  </build>
 </project>

module/jsr374/pom.xml

@@ -66,4 +66,13 @@
       <scope>test</scope>
     </dependency>
   </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+      </plugin>
+    </plugins>
+  </build>
 </project>