Update to Rails 2.3.16

To mitigate a recent Rails vulnerabilitiy

https://groups.google.com/forum/?fromgroups=#!topic/rubyonrails-security/1h2DR63ViGo

I just did a `bundle update` to get us on the most recent 'everything'.

Change-Id: I22f52b89ce65a804f17533a222d6109c3ecf8ed1
Reviewed-on: https://gerrit.causes.com/17948
Reviewed-by: Lann Martin <lann@causes.com>
Tested-by: Aiden Scandella <aiden@causes.com>