apiextensions release v0.4.1

Added

• Categories for all CRDs.

Changed

• Make .status.kvm.nodeIndexes of KVMConfig optional.
• Update example application group CRDs to include version labels.

Fixed

• Serialization of KVM fields MemorySizeGB, StorageSizeGB, and Disk broken during migration to kubebuilder.
• Code generation from within $GOPATH.
• Loading of AWSMachineDeployment CRD.