Revert "Use /usr/lib/jvm/default-java as JAVA_HOME for TravisCI."
Revert "Use /usr/lib/jvm/default-java as JAVA_HOME for TravisCI."

This reverts commit fb546aa1ce7711b8f79fcbb43b9eafaa7003ad4d.

retuxx/tinyspline,msteinbeck/tinyspline,msteinbeck/tinyspline,retuxx/tinyspline,msteinbeck/tinyspline,retuxx/tinyspline,msteinbeck/tinyspline,msteinbeck/tinyspline,msteinbeck/tinyspline,msteinbeck/tinyspline,msteinbeck/tinyspline