Update jQuery to 2.2.4 and 3.x

[shreyas-satish]

jQuery on Baseframe is currently on 2.1.3. We should upgrade to 2.2.4 and allow clients to use the latest 3.x branch optionally.

TODO:

• Test existing apps to ensure they work on 2.2.4.
• Allow option to use the latest 3.x version.

Related:

• https://blog.jquery.com/2016/01/08/jquery-2-2-and-1-12-released/
• https://blog.jquery.com/2017/03/16/jquery-3-2-0-is-out/
• Update jQuery to 3.x boxoffice#177

[shreyas-satish]

Once this is done, the jQuery customization that was introduced in hasgeek/boxoffice#178 should be removed.

[jace]

Any reason to not just use 3.x everywhere?

[shreyas-satish]

We could do that, but we'll of course have to first test all our apps with 3.x and make necessary changes.