Log Message:
Update ruby-raindrops to 0.13.0.

=== raindrops 0.13.0  several minor fixes and improvements / 2014-02-18 20:59 UTC

  Most notably, this release is necessary for Ruby 2.2 (dev).
  Thanks to Koichi Sasada for the bug report!

  Eric Wong (5):
        Rakefile: remove raa_update task
        last_data_recv: do not assume Unicorn includes all constants
        raindrops.gemspec: add wrongdoc dev dependency
        linux_inet_diag: fix Ruby 2.2 (dev) build
        license: use LGPLv2.1 or later (was LGPL (2.1|3.0)-only)

  Hleb Valoshka (1):
        Remove Scope IDs from IPv6 addresses.