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
Fix git log pretty format argument
Fix node-info to show right node version

Currently, node-info shows nothing if $version is different than 'none'.
Merge branch 'master' from sorin-ionescu/prezto