Configure the intellij integration with sources

build.gradle

@@ -5,6 +5,7 @@ plugins {
     id "org.asciidoctor.gradle.asciidoctor" version "1.5.1"
     id 'codenarc'
     id 'groovy'
+    id 'idea'
     id 'application'
 }
 
@@ -69,6 +70,13 @@ dependencies {
     testCompile 'org.spockframework:spock-core:0.7-groovy-2.0'
     testCompile 'cglib:cglib-nodep:2.2.+'
 }
+
+idea {
+    module {
+        downloadJavadoc = true
+        downloadSources = true
+    }
+}
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