Add JDK 7 tests for ubuntu + windows
diff --git a/Jenkinsfile.sample b/Jenkinsfile.sample
index ca7cb14..066239c 100644
--- a/Jenkinsfile.sample
+++ b/Jenkinsfile.sample
@@ -22,6 +22,8 @@
 node('Windows') {
         def JAVA_JDK_8=tool name: 'JDK 1.8 (latest)', type: 'hudson.model.JDK'
         echo "Testing with Java $JAVA_JDK_8"
+        def JAVA_JDK_7=tool name: 'JDK 1.7 (latest)', type: 'hudson.model.JDK'
+        echo "Testing with Java $JAVA_JDK_7"
         def MAVEN_3_LATEST=tool name: 'Maven 3 (latest)', type: 'hudson.tasks.Maven$MavenInstallation'
         echo "Testing with Maven $MAVEN_3_LATEST"
         def MAVEN_2_LATEST=tool name: 'Maven 2 (latest)', type: 'hudson.tasks.Maven$MavenInstallation'
@@ -36,6 +38,13 @@
                 }
         } //end stage JAVA 1.8
         
+        stage('JAVA 1.7 (Latest) on Windows'){
+        withEnv(["Path+JDK=$JAVA_JDK_7\\bin","JAVA_HOME=$JAVA_JDK_7"]) {
+                bat "java -version"
+                bat "javac -version"
+                }
+        } //end stage JAVA 1.7
+        
         stage('MAVEN 3 (Latest) on Windows'){
         withEnv(["Path+JDK=$JAVA_JDK_8\\bin","Path+MAVEN=$MAVEN_3_LATEST\\bin","JAVA_HOME=$JAVA_JDK_8"]) {
                 bat "mvn -version"
@@ -60,6 +69,8 @@
 node('ubuntu') {
         def JAVA_JDK_8=tool name: 'JDK 1.8 (latest)', type: 'hudson.model.JDK'
         echo "Testing with Java $JAVA_JDK_8"
+        def JAVA_JDK_7=tool name: 'JDK 1.7 (latest)', type: 'hudson.model.JDK'
+        echo "Testing with Java $JAVA_JDK_7"
         def MAVEN_3_LATEST=tool name: 'Maven 3 (latest)', type: 'hudson.tasks.Maven$MavenInstallation'
         echo "Testing with Maven $MAVEN_3_LATEST"
         def MAVEN_2_LATEST=tool name: 'Maven 2 (latest)', type: 'hudson.tasks.Maven$MavenInstallation'
@@ -74,6 +85,13 @@
                 }
         } //end stage JAVA 1.8
         
+        stage('JAVA 1.7 (Latest) on Ubuntu'){
+        withEnv(["Path+JDK=$JAVA_JDK_7/bin","JAVA_HOME=$JAVA_JDK_7"]) {
+                sh "java -version"
+                sh "javac -version"
+                }
+        } //end stage JAVA 1.8
+        
         stage('MAVEN 3 (Latest) on Ubuntu'){
         withEnv(["Path+JDK=$JAVA_JDK_8/bin","Path+MAVEN=$MAVEN_3_LATEST/bin","JAVA_HOME=$JAVA_JDK_8"]) {
                 sh "mvn -version"