Merge branch 'hotfix/1.22.12'
use -mmacosx-version-min=10.6 for static rubies on OSX, update #2189
add ruby-2.0.0-p247 for osx 10.6 and 10.7, update #2189
improved requirements_check
fix checking if binary rubies can be used for jruby, fix #2232
1.22.13
Merge branch 'master' into hotfix/1.22.13
Merge branch 'hotfix/1.22.13' into stable