0.7.0

• Add ip6tables (IPv6) support (#56 - chantra)
• Add :none to one of the values that the attribute direction can be set to.
  When set to :none, a rule to jump to the chain created will not be added to any
  direction chains (#54 - Kevin Deng)
• Add node.simple_iptables.tables attribute to specify the tables for which rules
  will be generated (#53 - Pavel Yudin)
• Add Test Kitchen tests (#51 - Pavel Yudin)