Merge branch 'hotfix/1.22.14'
rubinius prefers ruby 2.0 for compilation, thanks @dbussink
select ruby-1.9 for rubinius-rc1 compilation
improve rubinius version checking for detecting compatibility ruby, update b2969d1
cleaning rubinius code
let rubinius just use __rvm_fetch_ruby instead of custom download code
extract rubinius_install_fix_repo_branch
use global not default for linking default gems path, imptove the process, closes #2236
clarify error message when creating gemset on system ruby, fix #2241
make sure groupadd an be found in standard paths, fix #2242
improve checking for rubinius head version, update #2235
Fixed a few typos in upgrade-notes.txt, closes #2238
1.22.15
Merge branch 'master' into hotfix/1.22.15
Merge branch 'hotfix/1.22.15' into stable