Rails upgrade to 4.1.7

New Rails vulns:

https://groups.google.com/forum/#!topic/rubyonrails-security/dCp7duBiQgo

https://groups.google.com/forum/#!topic/rubyonrails-security/wQBeGXqGs3E

Also, we don't want to lag too many releases behind. 

Please review :eyes: @robmckinnon, @stephenrichards & @colinbruce 

Thanks :smile_cat: