add a warning if user updtes rvm to version, fix #2427
add a warning for Zsh 5.0.3 - it is BROKEN, closes #2431
1.25.0
Merge branch 'release/1.25.0'
move the cd from cli to set operation to avoid subprocess, fix #2433
fix rubinius installation after switching to gem-wrappers, fix #2434
fix removing broken links in bin, fix #2436