Merge branch 'hotfix/1.26.3' into stable
communicate apt sources 404 errors
merge #3176: communicate apt sources 404 errors
correctly set opt_dir when building ruby-head, fix #3179
merge #3181: correctly set opt_dir when building ruby-head for freebsd
fix #3179
install clang/llvm on debian/ubuntu for rubinius
use cc/cxx options for rubinius configure on debina/ubuntu
move gemset empty to select ruby list, update #3170
update tests for #3170
extract gemset empty to separate action with __rvm_use, update #3170
prepend @ to gemset name in gemset empty, update #3170
build libyaml for redhat 6
remove command from xargs
use ruby-version when configuring custom build yaml flags
merge #3175: fix installing MRI on RHEL 6
merge #3182: use clang for rbx compilation on ubuntu/debian
update remote rubies to point to the cache, update #3180
jruby-1.7.16.2
ruby-2.2.0-preview2
+jruby-1.7.17