Ensure the sources jar gets uploaded to bintray

Fixes #195

build.gradle

@@ -54,10 +54,6 @@ subprojects {
         from sourceSets.main.allSource
     }
 
-    artifacts {
-        archives sourcesJar
-    }
-
     plugins.withType(JavaPlugin) {
         sourceCompatibility = 1.7
         targetCompatibility = 1.7

jruby-gradle-base-plugin/build.gradle

@@ -125,6 +125,10 @@ publishing {
             artifactId project.archivesBaseName
             version project.version
 
+            artifact sourcesJar {
+                classifier "sources"
+            }
+
             from components.java
         }
     }

jruby-gradle-jar-plugin/build.gradle

@@ -82,6 +82,9 @@ task installGroovyDoc (type : Copy) {
     onlyIf { project.hasProperty('jrubyGradleWebsiteInstallDir') }
 }
 
+artifacts {
+    archives sourcesJar
+}
 
 bintray {
     user = project.bintrayUser

jruby-gradle-war-plugin/build.gradle

@@ -12,6 +12,10 @@ dependencies {
     }
 }
 
+artifacts {
+    archives sourcesJar
+}
+
 bintray {
     user = project.bintrayUser
     key = project.bintrayKey