Upgrade to Ruby 2.2.2

[jonatack]

and fix the grammar in the ruby_version_check.rb user message.

[matthewd]

Err, why bump the dependency?

It's a security release, so there aren't many good reasons for someone to want to run 2.2.1... but we're not the Version Police. 👎

[morgoth]

I believe this bump will be required for #19752

[kaspth]

@matthewd We've deprecated alias_method_chain in favor of prepend, but there was bug when calling super which means we wouldn't be able to follow through with the recommendation. So, we update the version.

[matthewd]

@kaspth that's why we required 2.2.1, not 2.2.2, though.. right?

[matthewd]

(or was that a different bug?)

[kaspth]

No, 2.2.1 caused a segmentation fault with some form of keyword arguments (right, @eileencodes?).

[eileencodes]

Yea 2.2.1 was causing a segmentation fault

[jonatack]

http://svn.ruby-lang.org/repos/ruby/tags/v2_2_2/ChangeLog

Mon Apr 13 00:16:32 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
    * vm_eval.c (vm_call_super): search next super class from the
      original class, to get rid of infinite recursion with
      prepending.  a patch by Seiei Higa <hanachin AT gmail.com> at
      [ruby-core:68434].  [ruby-core:68093] [Bug #10847]

Mon Apr 13 00:09:48 2015  Koichi Sasada  <ko1@atdot.net>
    * class.c (rb_prepend_module): need a WB for klass -> origin.

[jonatack]

https://bugs.ruby-lang.org/issues/10847

[jonatack]

The bug fix appears to have been backported to the ruby_2_2 and ruby_2_1 branches.

[matthewd]

👍, if we're actually depending on the newer version / about to depend on the newer version, this is fine. My issue was that the PR originally presented as "hey there's a new version, let's require it" with no justification / explanation.