Release 0.5.0

Backwards-incompatible changes

• The symbol VAGRANT has been moved from libcloudvagrant.driver to libcloudvagrant.
• The Vagrant plugin vagrant-libcloud-helper is now required.
• libcloud-vagrant now checks that all components (Vagrant, VirtualBox and required plugins) are present and at the expected version numbers, throwing a RuntimeError if that's not the case.
• Driver methods ex_start_node() and ex_stop_node() have been removed.

Backwards-compatible changes

• Switch from nose to py.test for the test suite.
• The driver method create_node() now accepts an optional extension parameter ex_allocate_sata_ports, to select how many SATA ports will be allocated on the first SATA controller.

Bug fixes

• Destroying nodes with attached disks raised an error when detaching the disk (because the node destruction happened before the disk detach).
• When a node was destroyed, all volumes attached to it were not marked as detached.
• The command-line tool was not destroying volumes when requested to destroy everything.
• Destroying volumes did not remove them from the Virtualbox media registry.