Hammer time

Merge pull request #31 from jonludlam/0.9.4

Release 0.9.4

Lots of bugfixes

• Allow the Bond.create to carry on even if the MTU size is invalid
• network monitor: better represent duplex mode for NIC bonds
• Use "ip link" to find the MAC address and MTU of a NIC
• Batch IP monitor changes for 1 second
• Signal xapi when an IP address is removed
• networkd: introduce Linklocal6 IPv6 address mode