v0.6.3

This release renames the WiFi mode names. The old names still work so it's a
backwards compatible update. The new names are :ap and :infrastructure
instead of :host and :client. These names match the mode names in the IEEE
specifications and usage elsewhere.

• New features
  • Support static IPv4 configurations for a default gateway and list of name
    resolvers. See :gateway and :name_servers parameters.
  • Support ad-hoc WiFi networking (IBSS mode)