Security upgrade for Ruby (CVE-2013-4164)

https://www.ruby-lang.org/en/news/2013/11/22/heap-overflow-in-floating-point-parsing-cve-2013-4164/
bundle update rvm-capistrano
Create rvm application alias & wrappers so we don't need to update paths when upgrading Ruby

https://github.com/wayneeseguin/rvm-capistrano#create-application-alias-and-wrappers