0.7.0

• The method of configuring the ConsulClient has been reworked. It now
  uses Actions to configure the options inside itself - e.g.
  var client = new ConsulClient((cfg) => { cfg.Datacenter = "us-west-2"; }
  See the file Consul.Test/ClientTest.cs and the test method
  Client_Constructors() for more examples. The old method will work
  but has been made Obsolete.
• The ExecuteAbortableLocked method has been removed.
• Requests to use the X-Consul-Token header instead of the ?token=
  query parameter. This may break use of ACLs with very old Consuls (<
  0.6.0). Please file an issue if this breaks for you.
• Ported in changes from the Consul Go API for 0.7.0. Most of these
  require 0.7.0 servers/agents. The changes are:
  • Atomic transactions for the KV store
  • Only retry locks/semaphores on Consul errors, not on all errors
  • Add the Near property to Prepared Queries
  • Add Query Templates to Prepared Queries, with regex filtering
  • Change all requests to use the X-Consul-Token header instead of
    the ?token= query parameter.
  • Add the ability to deregister a service that has been critical for
    an arbitrary period of time.
  • Signal WAN address translation and add the ability to look up
    the WAN and LAN addresses if address translation is being used.
  • Added Operator API to allow Raft editing.
• Added the ability to set LockOpts.LockRetryTime. Thanks @pfrejlich!
• Add an optional CancellationToken parameter to every method that ends up
  doing an HTTP request. Some of these can create an unstable Consul state
  (e.g. allowing the release of a distribted Semaphore to be canceled) but in
  many cases they should only be used if the call can possibly fail and a
  secondary timeout is needed.
• Add .NET Core port and build process thanks to work by @akatz0813.
• Converted all Locks and Semaphores to be totally async thanks to
  work by @mjgoethe.
• Entirely removed the method ExecuteAbortableLocked and all
  functionality around aborting a thread based on a Consul lock.
• Reworked configuration of the ConsulClient to use Action<T> to
  configure options.