Update README.md

Fix readme
Merge pull request #61 from iroller/patch-2

Update README.md
Upgrade rails 4.1.0 to 4.1.5 for CVE-2014-3514
Don't forget to commit deleted vendor gems
Merge pull request #62 from zendesk/pobrien/rails_upgrade

Rails upgrade to address CVE-2014-3514 (activerecord create_with vulnerability)