migrated to JenkinsCI

scripts/release.js

 }
 
 function validateEnv() {
-  if (!process.env.CI || !process.env.TRAVIS) {
-    throw new Error(`releasing is only available from Travis CI`);
+  if (!process.env.CI) {
+    throw new Error(`releasing is only available from CI`);
   }
 
-  if (process.env.TRAVIS_BRANCH !== 'master') {
-    console.error(`not publishing on branch ${process.env.TRAVIS_BRANCH}`);
-    return false;
-  }
-
-  if (process.env.TRAVIS_PULL_REQUEST !== 'false') {
-    console.error(`not publishing as triggered by pull request ${process.env.TRAVIS_PULL_REQUEST}`);
+  if (!process.env.JENKINS_MASTER) {
+    console.log(`not publishing on a different build`);
     return false;
   }