added travis ci config

Author: holgerbrandl

.travis.yml

@@ -0,0 +1,8 @@
+language: java
+
+## https://docs.travis-ci.com/user/languages/java
+## http://stackoverflow.com/questions/20707017/how-to-run-junit-tests-with-gradle
+## how to run tests with gradle https://docs.gradle.org/current/userguide/tutorial_gradle_command_line.html
+## gradle check or gradle test
+
+## http://stackoverflow.com/questions/17606874/trigger-a-travis-ci-rebuild-without-pushing-a-commit