Update lib/moped/node.rb
Update lib/moped/node.rb

tuning to support ipv6 DNS entry
now the config support:
- IPv4
- DNS entry which is an IPv4
- DNS entry which is an IPv6

mongoid/moped,drobune/moped,johnnytomcat/moped,crashlytics/moped,ramen-dev/moped,agis-/moped,fcruxen/moped,wandenberg/moped,newsdev/moped,jonhyman/moped,sferik/moped,skroutz/moped,aijanai/moped