Recognizing Jenkinsfile as Groovy source.

samples/Groovy/filenames/Jenkinsfile

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+jettyUrl = 'http://localhost:8081/'
+
+def servers
+
+stage 'Dev'
+node {
+    checkout scm
+    servers = load 'servers.groovy'
+    mvn '-o clean package'
+    dir('target') {stash name: 'war', includes: 'x.war'}
+}
+
+stage 'QA'
+parallel(longerTests: {
+    runTests(servers, 30)
+}, quickerTests: {
+    runTests(servers, 20)
+})
+
+stage name: 'Staging', concurrency: 1
+node {
+    servers.deploy 'staging'
+}
+
+input message: "Does ${jettyUrl}staging/ look good?"
+
+stage name: 'Production', concurrency: 1
+node {
+    sh "wget -O - -S ${jettyUrl}staging/"
+    echo 'Production server looks to be alive'
+    servers.deploy 'production'
+    echo "Deployed to ${jettyUrl}production/"
+}
+
+def mvn(args) {
+    sh "${tool 'Maven 3.x'}/bin/mvn ${args}"
+}
+
+def runTests(servers, duration) {
+    node {
+        checkout scm
+        servers.runWithServer {id ->
+            mvn "-o -f sometests test -Durl=${jettyUrl}${id}/ -Dduration=${duration}"
+        }
+    }
+}