Fix jquery deprecation.

[dogomedia-github]

This is an updated pull request to fix the jquery ready event deprecation. As more and more deployments are moving to newer Jquery versions, it would be a good idea to fix this once and for all.

I've reviewed all the previous pull requests such as #575, #447, and #379. It looks like all of them had problems but #447 had a proper fix in the notes, only the original contributor never updated the pull request.

I've updated the pull based on the solution in #447 but with the updated events page:load turbolinks:load turbo:load.

[nathanvda]

Thank you for your PR and your investigative work (checking all the old PR's).

I had to re-check the #447, I am very glad you did this work. For me it was not a big issue, because I always use turbolinks, but I understand the current code does not work if people are only using jquery and not turbolinks (any version thereof).

[rmaspero]

Am I right in thinking this hasn't been published in the NPM package yet?

[edbarbera]

Does this change warrant a bump in the version number? Does it change anything for users that don't use turbolinks? e.g. is it backwards compatible? I know it's a quite a while since it was merged, but just wondering as I've been upgrading to JQuery 3 and have had to fix Cocoon to this commit hash.