Merge pull request #2389 from nicolasnoble/let-s-run-ruby-on-macos

Setting up ruby environment for macos.

tools/jenkins/run_jenkins.sh

@@ -31,6 +31,8 @@
 # This script is invoked by Jenkins and triggers a test run based on
 # env variable settings.
 #
+# Setting up rvm environment BEFORE we set -ex.
+[[ -s /etc/profile.d/rvm.sh ]] && . /etc/profile.d/rvm.sh
 # To prevent cygwin bash complaining about empty lines ending with \r
 # we set the igncr option. The option doesn't exist on Linux, so we fallback
 # to just 'set -ex' there.