Log Message:
Update ruby2ruby to 2.2.0.

pkgsrc change: add support for pkg_alternatives.

=== 2.2.0 / 2015-05-27

* 1 minor enhancement:

  * Normalized block arg goalposts (always there unless arg slot == 0).

=== 2.1.4 / 2015-04-13

* 1 minor enhancement:

  * Wrap fewer hash values in parentheses. (jaredbeck)

* 1 bug fix:

  * Fixed handling of kwsplat args.