Only build on JDK8, targeting JDK7 compatibility though

Stupid errors in Travis make the build feedback not very useful

.travis.yml

@@ -1,7 +1,5 @@
 language: java
-# Only the oraclejdk7 build on a tag will actually release
 jdk:
-- oraclejdk7
 - oraclejdk8
 
 # Using 'install' to run the clean to avoid Travis automatically calling

build.gradle

@@ -15,6 +15,23 @@ version = '0.4.0'
 mainClassName = 'com.github.lookout.verspaetung.Main'
 defaultTasks 'check', 'assemble'
 
+/* Ensure we properly build for JDK7 still */
+plugins.withType(JavaPlugin) {
+    sourceCompatibility = 1.7
+    targetCompatibility = 1.7
+
+
+    project.tasks.withType(JavaCompile) { task ->
+        task.sourceCompatibility = project.sourceCompatibility
+        task.targetCompatibility = project.targetCompatibility
+    }
+
+    project.tasks.withType(GroovyCompile) { task ->
+        task.sourceCompatibility = project.sourceCompatibility
+        task.targetCompatibility = project.targetCompatibility
+    }
+}
+
 
 ////////////////////////////////////////////////////////////////////////////////
 //  TESTING
@@ -147,10 +164,10 @@ bintray {
     publish = true
     /*
      * Only only publish when we're tagging a release and if we've executed on
-     * the JDK7 build. This is to prevent multiple attempts by the build matrix
+     * a JDK8 build. This is to prevent multiple attempts by the build matrix
      * to publish the artifacts
      */
-    dryRun = !((System.env.TRAVIS_TAG as boolean) && (System.env.TRAVIS_JDK_VERSION == 'oraclejdk7'))
+    dryRun = !((System.env.TRAVIS_TAG as boolean) && (System.env.TRAVIS_JDK_VERSION == 'oraclejdk8'))
     configurations = ['archives']
 
     pkg {