Update ruby-raindrops to 0.12.0.

=== raindrops 0.12.0 - compatibility fixes / 2013-09-02 10:33 UTC

  This release fixes builds on systems where compilers target i386
  (and not later x86 systems).  There are also minor improvements for
  Ruby 2.1.0dev and Rubinius.

  Eric Wong (5):
        doc: add email address to generated doc/site
        README: update regarding Ruby support status
        extconf: try harder for gcc atomics in i386-configured systems
        linux_inet_diag: improve compatibility with newer GCs
        test_watcher: fix for Ruby trunk r40195 and later

=== raindrops 0.11.0 - minor fixes improvements / 2013-04-20 23:10 UTC

  Eric Wong (7):
        raindrops: favor configured processor count over online count
        watcher: set Content-Type via assignment
        Linux::TCP_Info: implement #get! instance method
        linux_inet_diag: avoid unnecessary sockaddr initialization
        .gitignore: add .rbx
        switch back to gemspec development dependencies
        linux_inet_diag: better align listener_stats struct

  Lawrence Pit (1):
        Watcher: Use relative paths in HTML links

(taca)