This adds termination support to the ec2 module
updating edx_sandbox, creating edx_sandbox_jenkins.yml
setting private key for jenkins
removing commented out line
changing the way the terminate options is used
Merge branch 'master' into jarv/termination-support
adding xserver/xqueue roles to edx_sandbox_jenkins
Merge remote-tracking branch 'origin/feanil/xserver_vars' into jarv/termination-support
Merge pull request #121 from edx/jarv/termination-support

This adds termination support to the ec2 module