Repository Commits Get All

Added the logic for getting all commits for a repository including unit
tests and XML docs

Octokit.Tests.Integration/Clients/RepositoryCommitsClientTests.cs

@@ -26,6 +26,13 @@ public class RepositoryCommitsClientTests : IDisposable
         _repository = _client.Repository.Create(new NewRepository { Name = repoName, AutoInit = true }).Result;
     }
 
+    [IntegrationTest]
+    public async Task CanGetListOfCommits()
+    {
+        var list = await _fixture.GetAll("octokit", "octokit.net");
+        Assert.NotEmpty(list);
+    }
+
     [IntegrationTest]
     public async Task CanCompareReferences()
     {