added floatingip
added associate_floatingip and disassosiate_floatingip mock test
update associate_floatingip for real
deleted update_floatingip and changed variable name from floating_network_id to floatingip_id.
fixed disassociate_floatingip bug and update floatingip-* mock values.
updated for ruby naming conventions.
deleted old files eg. floatingip.rb
Merge pull request #1396 from kanetann/master

added floatingip methods to Fog::OpenStack::Network