Added closing of stdout for child processes preventing the hang in some cases (fixes #121).

Also removed close in another place as it is redundant now.

GitTfs/Core/GitHelpers.cs

@@ -83,7 +83,6 @@ namespace Sep.Git.Tfs.Core
 
             public override void Close()
             {
-                process.StandardOutput.Close();
                 helper.Close(process);
             }
 
@@ -191,6 +190,14 @@ namespace Sep.Git.Tfs.Core
 
         private void Close(Process process)
         {
+            // if caller doesn't read entire stdout to the EOF - it is possible that 
+            // child process will hang waiting until there will be free space in stdout
+            // buffer to write the rest of the output. To prevent such situation we'll
+            // close stdout to indicate we're no more interested in it, thus allowing
+            // child process to proceed.
+            // See https://github.com/git-tfs/git-tfs/issues/121 for details.
+            process.StandardOutput.Close();
+
             if (!process.WaitForExit((int)TimeSpan.FromSeconds(10).TotalMilliseconds))
                 throw new GitCommandException("Command did not terminate.", process);
             if(process.ExitCode != 0)