kvm-ioctls-v0.2.0

• Fix bug in KvmRunWrapper. The memory for kvm_run struct was
  not unmapped after the KvmRunWrapper object got out of scope.
• Return proper value when receiving the EOI KVM exit.
• Add support for KVM_ENABLE_CAP.
• Add support for KVM_SIGNAL_MSI.
• Mark set_user_memory_region as unsafe.