Fix Travis error https could not be found

Travis builds are breaking with this error: The method driver
/usr/lib/apt/methods/https could not be found

bin/ci/before_install.sh

@@ -7,6 +7,7 @@ source ./bin/ci/common.sh
 echo "$(tmstamp) *** before_install::apt-get starting $(date) ***"
 wget http://oss.oracle.com/el4/RPM-GPG-KEY-oracle -O - | sudo apt-key add -
 sudo bash -c 'echo "deb https://oss.oracle.com/debian unstable main non-free" >> /etc/apt/sources.list'
+sudo apt-get install apt-transport-https
 sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 16126D3A3E5C1192
 sudo apt-get update -qq
 sudo apt-get install -qq \