Add Domain.Undefine (#7, thanks dorzheh)
Plus test changes
Adding GetType allowing to fetch the name of the Hypervisor driver used
GetType doesn't need to be free'd, plus test
Adding for VirConnection: IsAlive, IsSecure, IsEncrypted
Tests for Alive, Secure, Encrypted
Adding for VirConnection: ListDefinedInterfaces,ListDefinedNetworks,ListDefinedStoragePools
Tests for ListDefinedNetworks/Interfaces/StoragePools
Add VirDomain.SetMetadata, thanks @dorzheh
Adding for VirConnection:  NumOfDefinedInterfaces,NumOfDefinedNetworks,NumOfDefinedStoragePools, NumOfDomains,NumOfInterfaces,NumOfNetworks,NumOfNWFilters
Tests for VirConnection.NumOf*
Merge branch '6_newmethods'
Adding virNetwork (two files : network.go and network_test.go)