Replace ruby-19-centos with ruby-20-centos
Merge pull request #145 from mfojtik/ruby-20-centos

Replace ruby-19-centos with ruby-20-centos
[DEVEXP-340] Add e2e test to automated suite
Merge pull request #146 from jcantrill/340-e2e

[DEVEXP-340] Add e2e test to automated suite
Switch back to magnetic ebs for now