Adds source jar artifact to gradle

gradle/scripts/artifacts.gradle

@@ -10,6 +10,11 @@ task javadocJar(type: Jar, dependsOn: myJavadocs) {
     from 'build/docs/javadoc/'
 }
 
+task sourceJar(type: Jar, dependsOn: classes) {
+    classifier = 'sources'
+    from sourceSets.main.allSource
+}
+
 task devJar(type: Jar) {
 
     manifest {
@@ -40,4 +45,5 @@ artifacts {
     archives devJar
     archives apiJar
     archives javadocJar
+    archives sourceJar
 }