add MANIFEST to .gitignore
move storage pool info processing in controller

All XML processing for gathering information about StoragePool is
specific to Libvirt. It is therefore better placed in VirtController
class.
move storage volume info processing in controller

All XML processing for gathering information about StorageVolume is
specific to Libvirt. It is therefore better placed in VirtController
class.
move domain info processing in controller

All XML processing for gathering information about Domain is specific
to Libvirt. It is therefore better placed in VirtController class.
correct typos in docstrings
cloubed release v0.4