Merge branch 'hotfix/1.21.12'
add a warning when PATH does not start with GEM_HOME, fix #2044
simplify rvm_ruby_name calculation for external rubies, fix #2045
add plusr explanation to irc webchat
improve hooks/after_cd_bundler to remove_old_bundler_bin when switchingg between bundled directories
reworked hooks/after_cd_bundler
add tests for hooks/after_cd_bundler
improve the Zsh warning, if you do not use Zsh - ignore it
fix rvm_warn in installer before rvm is downloaded
update formatting rules numbering
Merge pull request #2046 from j4y/master

update formatting rules numbering
fix ruby warnings, fix #2047
fix and simplify pkgng detecton for freebsd, fix #2048, thanks @cognitiveflux
extra check for pkgng detecton for freebsd, update #2048, thanks @cognitiveflux
1.21.13
Merge branch 'master' into hotfix/1.21.13
Merge branch 'hotfix/1.21.13' into stable