attach volume, device made optional
Volume status conversion improved
Key name fix
metadata storing during instance creation
Instance metadata basic support
removed metadata from to_hash method
Metadata disabled
Preentation of openstack metadata in json format

Conflicts:
	server/lib/deltacloud/drivers/openstack/openstack_driver.rb
Metadata formatting
Metadata json parsing error will result in error responses
Changed metadata xml presentation
Metadata update

Conflicts:
	server/lib/deltacloud/drivers/openstack/openstack_driver.rb
Improved json prasing for metadata
Added possibility to modify specific keys in metadata
Delete metadata basic methods
Update metadata parameters renamed: metakey->key, metavalue->value
Updated instances handler methods
Metadata as a TEST entity has a GET/POST/DELETE method
Each will return entity after request
Fixed metadata import