main/ruby-rails: upgrade to 3.2.21

fixes #2579
fixes #2805
fixes #2808
fixes #2942
fixes #3151
fixes #3474
fixes #3580
fixes #3584

CVE-2013-0334
CVE-2013-4389
CVE-2013-4492
CVE-2013-6414
CVE-2013-6415
CVE-2013-6417
CVE-2014-0081
CVE-2014-0082
CVE-2014-0130
CVE-2014-3482
CVE-2014-3483
CVE-2014-7818
CVE-2014-7819
main/ruby-redmine-rails: upgrade to 3.2.21

fixes #2805
fixes #2808
fixes #2942
fixes #3151
fixes #3580
fixes #3584

CVE-2013-4389
CVE-2013-6414
CVE-2013-6415
CVE-2013-6417
CVE-2014-0081
CVE-2014-0082
CVE-2014-0130
CVE-2014-3482
CVE-2014-3483
CVE-2014-7818
CVE-2014-7819
main/ruby-sprockets: upgrade to 2.2.3 (CVE-2014-7819)

fixes #3584