Merge pull request #2425 from elgalu/patch-1

Typo "rvm clean up all" should be "rvm cleanup all"
add a star for the new warning for cleanup
Merge branch 'master' into features/cygwin
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' into stable
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
add an improved warning for older ruby binaries, closes #2438
fix installing older rubies
improved output messages for installation
simplify logging dots
updated tests for new ruby installation messages
cleanup wrappers leftovers, fix #2441
ensure wrappers are in place before creating links for them, fix #2440
use the fedora like patches on all affected ruby versions, fix #2439
fix ensuring environemnt file exist, fix #2442