Update api for relation
* GET request for relations returns an Array of the relations
* DELETE request for a relation returns the uuid
Add specs for SecurityGroups
Merge remote branch 'origin/master' into feature-webapi

Conflicts:
	vnet/spec/vnet/openflow/service_manager_spec.rb
Change error notifications for StandardError
Add support for pagination
Enable to pass Hash object
Fix a bug
Fix response of POST /:dns_service_uuid/dns_records
Merge remote branch 'origin/master' into feature-webapi

Conflicts:
	vnet/lib/vnet/endpoints/1.0/interfaces.rb
	vnet/lib/vnet/model_wrappers/base.rb
Merge pull request #187 from axsh/feature-webapi

Feature webapi
Merge remote branch 'origin/master' into refactor-tunnels