Enable 'acls', 'xattrs' support in rsync whenever available

rsync has support for these available in most cases and isn't
specific to Mac OS X any more.

Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
Load Homebrew installed NVM
Fix typo in Perl module readme
[Fix #698] Describe module in README the same as in code