[GH-82] Updated README regarding IP pools

PR #39 "Support for VM IP pools" removed the limitation that vcloud-launcher
don't supported pools, but the README was not uppdated to reflect this.
Merge pull request #83 from rickard-von-essen/issue-82

[GH-82] Updated README regarding IP pools
Thank contributor in CHANGELOG
Merge pull request #85 from gds-operations/update_changelog

Thank contributor in CHANGELOG
Call vcloud-logout after integration tests

To guard us against the possibility that our vCloud session tokens might be
exposed and copy/pasted from CI build output. I'm using a `trap` to ensure
that this gets called regardless of whether the spec or integrations tests
fail.
Release 0.6.0

So that the following are available to users:

- vcloud-logout utility: gds-operations/vcloud-core@ab465cc5acec906120d6713e2a2ae4e3d1138c19
- Fog bugfix for usernames: gds-operations/vcloud-core@f52d618638b27a5bf2998f8cba133fcb5e81f33e
Merge pull request #86 from gds-operations/vcloud_logout_after_tests

[#75811634] vcloud-logout after tests and new release
Merge branch 'master' into attach_independent_disks_redo

Conflicts:
	vcloud-launcher.gemspec
Update CHANGELOG