Merge branch 'hotfix/1.23.11'
Revert "move rvm_configure_env to rvm_configure_flags for REE, update #2307"

This reverts commit 53f9cc36684001ec985b8b23158ceca57abb013a.
add rubygems md5s 2.0.13 and 2.1.10
1.23.12
Merge branch 'master' into hotfix/1.23.12
Merge branch 'hotfix/1.23.12' into stable