Added option to fetch all

Author: ThomasAunvik

src/GitHub.Api/Git/GitClient.cs

@@ -276,7 +276,7 @@ public ITask<string> Fetch(string remote,
         {
             //Logger.Trace("Fetch");
 
-            return new GitFetchTask(remote, cancellationToken, true, processor)
+            return new GitFetchTask(remote, cancellationToken, true, true, processor)
                 .Configure(processManager);
         }
 

src/GitHub.Api/Git/Tasks/GitFetchTask.cs

@@ -10,13 +10,18 @@ class GitFetchTask : ProcessTask<string>
         private readonly string arguments;
 
         public GitFetchTask(string remote,
-            CancellationToken token, bool prune = false, IOutputProcessor<string> processor = null)
+            CancellationToken token, bool all = false, bool prune = false, IOutputProcessor<string> processor = null)
             : base(token, processor ?? new SimpleOutputProcessor())
         {
             Name = TaskName;
             var stringBuilder = new StringBuilder();
             stringBuilder.Append("fetch");
 
+            if (all)
+            {
+                stringBuilder.Append(" --all");
+            }
+
             if (prune)
             {
                 stringBuilder.Append(" -p");
@@ -34,4 +39,4 @@ public GitFetchTask(string remote,
         public override string ProcessArguments { get { return arguments; } }
         public override TaskAffinity Affinity { get { return TaskAffinity.Exclusive; } }
     }
-}
+}