[WIP] Add repository traffic preview (#1457)

* Add response models

* Supress message

* correct spelling Timestamp

* implement traffic client

* add reactive client

* [WIP] unit tests

* add argument check

* finish unit tests

* add integration tests

* Change repositoryId from int to long
Remove GetAll naming of endpoints and add to PaginationTest exclusions
Rename View and Clone classes to be more specific
Add handling of TimeStamp fields being UtcUnix time
Add integration tests for repositoryId methods

Octokit/Models/Request/RepositoryTrafficRequest.cs

@@ -0,0 +1,23 @@
+using System.Diagnostics;
+using System.Globalization;
+
+namespace Octokit
+{
+    [DebuggerDisplay("{DebuggerDisplay,nq}")]
+    public class RepositoryTrafficRequest : RequestParameters
+    {
+        public RepositoryTrafficRequest() { }
+
+        public RepositoryTrafficRequest(TrafficDayOrWeek per)
+        {
+            Per = per;
+        }
+
+        public TrafficDayOrWeek Per { get; private set; }
+
+        internal string DebuggerDisplay
+        {
+            get { return string.Format(CultureInfo.InvariantCulture, "Per: {0}", Per); }
+        }
+    }
+}