Rename Message to CommitMessage

According to the docs
(https://developer.github.com/v3/pulls/#merge-a-pull-request-merge-button),
this should be sent as "commit_message" thus we need to name it
`CommitMessage`
Fixes #913

Octokit.Tests.Integration/Clients/PullRequestsClientTests.cs

@@ -194,7 +194,7 @@ public class PullRequestsClientTests : IDisposable
         var newPullRequest = new NewPullRequest("a pull request", branchName, "master");
         var pullRequest = await _fixture.Create(Helper.UserName, _repository.Name, newPullRequest);
 
-        var merge = new MergePullRequest { Message = "thing the thing" };
+        var merge = new MergePullRequest { CommitMessage = "thing the thing" };
         var result = await _fixture.Merge(Helper.UserName, _repository.Name, pullRequest.Number, merge);
 
         Assert.True(result.Merged);
@@ -221,7 +221,7 @@ public class PullRequestsClientTests : IDisposable
         var newPullRequest = new NewPullRequest("a pull request", branchName, "master");
         var pullRequest = await _fixture.Create(Helper.UserName, _repository.Name, newPullRequest);
 
-        var merge = new MergePullRequest { Message = "thing the thing", Sha = pullRequest.Head.Sha };
+        var merge = new MergePullRequest { CommitMessage = "thing the thing", Sha = pullRequest.Head.Sha };
         var result = await _fixture.Merge(Helper.UserName, _repository.Name, pullRequest.Number, merge);
 
         Assert.True(result.Merged);
@@ -250,7 +250,7 @@ public class PullRequestsClientTests : IDisposable
         var newPullRequest = new NewPullRequest("a pull request", branchName, "master");
         var pullRequest = await _fixture.Create(Helper.UserName, _repository.Name, newPullRequest);
 
-        var merge = new MergePullRequest { Message = "thing the thing" };
+        var merge = new MergePullRequest { CommitMessage = "thing the thing" };
         var result = await _fixture.Merge(Helper.UserName, _repository.Name, pullRequest.Number, merge);
 
         var master = await _client.GitDatabase.Reference.Get(Helper.UserName, _repository.Name, "heads/master");

Octokit.Tests/Clients/PullRequestsClientTests.cs

@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using NSubstitute;
-using Octokit.Tests.Helpers;
 using Xunit;
 
 namespace Octokit.Tests.Clients
@@ -140,7 +139,7 @@ namespace Octokit.Tests.Clients
             [Fact]
             public void PutsToCorrectUrl()
             {
-                var mergePullRequest = new MergePullRequest { Message = "fake commit message" };
+                var mergePullRequest = new MergePullRequest { CommitMessage = "fake commit message" };
                 var connection = Substitute.For<IApiConnection>();
                 var client = new PullRequestsClient(connection);
 
@@ -157,9 +156,9 @@ namespace Octokit.Tests.Clients
                 var client = new PullRequestsClient(connection);
 
                 await Assert.ThrowsAsync<ArgumentNullException>(() =>
-                    client.Merge(null, "name", 42, new MergePullRequest { Message = "message" }));
+                    client.Merge(null, "name", 42, new MergePullRequest { CommitMessage = "message" }));
                 await Assert.ThrowsAsync<ArgumentNullException>(() =>
-                    client.Merge("owner", null, 42, new MergePullRequest { Message = "message" }));
+                    client.Merge("owner", null, 42, new MergePullRequest { CommitMessage = "message" }));
                 await Assert.ThrowsAsync<ArgumentNullException>(() =>
                     client.Merge("owner", "name", 42, null));
             }

Octokit.Tests/Reactive/ObservablePullRequestsClientTests.cs

@@ -225,7 +225,7 @@ namespace Octokit.Tests.Reactive
             [Fact]
             public void MergesPullRequest()
             {
-                var mergePullRequest = new MergePullRequest { Message = "fake commit message" };
+                var mergePullRequest = new MergePullRequest { CommitMessage = "fake commit message" };
                 var gitHubClient = Substitute.For<IGitHubClient>();
                 var client = new ObservablePullRequestsClient(gitHubClient);
 
@@ -241,9 +241,9 @@ namespace Octokit.Tests.Reactive
                 var client = new PullRequestsClient(connection);
 
                 await Assert.ThrowsAsync<ArgumentNullException>(() =>
-                    client.Merge(null, "name", 42, new MergePullRequest { Message = "message" }));
+                    client.Merge(null, "name", 42, new MergePullRequest { CommitMessage = "message" }));
                 await Assert.ThrowsAsync<ArgumentNullException>(() =>
-                    client.Merge("owner", null, 42, new MergePullRequest { Message = "message" }));
+                    client.Merge("owner", null, 42, new MergePullRequest { CommitMessage = "message" }));
                 await Assert.ThrowsAsync<ArgumentNullException>(() =>
                     client.Merge("owner", "name", 42, null));
             }

Octokit/Models/Request/MergePullRequest.cs

@@ -1,20 +1,22 @@
-
-using System;
+using System;
 using System.Diagnostics;
 using System.Globalization;
 
 namespace Octokit
 {
     /// <summary>
-    /// Used to merge a pull request.
+    /// Used to merge a pull request (Merge Button).
     /// </summary>
+    /// <remarks>
+    /// https://developer.github.com/v3/pulls/#merge-a-pull-request-merge-button
+    /// </remarks>
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     public class MergePullRequest
     {
         /// <summary>
         /// The message that will be used for the merge commit (optional)
         /// </summary>
-        public string Message { get; set; }
+        public string CommitMessage { get; set; }
 
         /// <summary>
         /// The SHA that pull request head must match to allow merge (optional)
@@ -25,7 +27,7 @@ namespace Octokit
         {
             get
             {
-                return String.Format(CultureInfo.InvariantCulture, "Message: '{0}', Sha: '{1}'", Message, Sha);
+                return String.Format(CultureInfo.InvariantCulture, "Message: '{0}', Sha: '{1}'", CommitMessage, Sha);
             }
         }
     }