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travis-ci

Set DiffServ (QoS) bit on Outbound Connections (#516)

The QoS option is configurable using DiffServ names AF11, etc.
DiffServ names correspond with rfc4594 recommended values,
that are also implemented with iptables.
A ToS bit is Configurable using DefaultConnectionOptions.TosPriority
configuration parameter on create server.

The QoS feature was implmeented with a dual stack network in mind.
setsockopt will throw an error if the wrong address family flag
is called.
- Adding Configuration Parameter TosPriority to ConnectonOptions.
- dscpName to interger value in tos.go.
- Test dscp value mapping is compliant with RFC4594 recommened values.
- TestTosPriority in connection_test.go to verify the outgoing socket
  has the correct ToS Bit set.

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