Merge branch 'hotfix/1.21.4'
Repair typos changing bellow to below.
Merge pull request #2005 from tjchambers/master

Correct typo's in messages
preserve rvm_quiet_curl_flag so it is not cleaned when sourcing rvm before installing ruby along with rvm, fix #2006
Merge branch 'master' of github.com:wayneeseguin/rvm
fix detecting rvm PATH modification in /etc/bash.bashrc, update #2001
fix 001 chmod problem, update #2001
fix 002 chmod/chown problem, update #2001
fix 003 chmod/chown problem, update #2001
it is obvious that /usr/local/rvm is system installation, detect it first before checking $HOME as it is not set on puppet / chef which breaks everything
fix 004 chmod/chown problem, update #2001
extra detetion of broken permissions to single helper, add debug output, update #2001
reworked notes for clarity
reordering installation dislay order for clarity
improved detection of user name in display_thank_you
reworked installation and improved debugging, update #2001
reworked installer, mostly reordering code - but also cleaning
fix error for installing zsh completion files, update #2001
use cat instead of cp to make use of default directory permissions for multiuser installation files, fixes #2001
make sure __rvm_rm_rf is available ins installer, update #2001