Update outdated require
Update sanitize gem

I’m not positive that all the spec changes are acceptable, as to some
  extent, I’m not sure how much was relying on the default behavior of
  the old sanitize version vs. what’s actually cared about.
Merge pull request #1 from lkemmerer/upgrade-sanitize-gem

Upgrade sanitize gem
Lock sanitize to major version 2

Done because v3 has dependencies that don’t work with jruby