Merge branch 'mn/send-email-works-with-credential'

Hooks the credential system to send-email.

* mn/send-email-works-with-credential:
  git-send-email: use git credential to obtain password
  Git.pm: add interface for git credential command
  Git.pm: allow pipes to be closed prior to calling command_close_bidi_pipe
  Git.pm: refactor command_close_bidi_pipe to use _cmd_close
  Git.pm: fix example in command_close_bidi_pipe documentation
  Git.pm: allow command_close_bidi_pipe to be called as method

diff --cc perl/Git.pm
index 57a1716,377f7ba..96cac39
--- 1/perl/Git.pm
--- 2/perl/Git.pm
+++ b/perl/Git.pm
@@@ -59,7 -59,7 +59,8 @@@ require Exporter
                  command_bidi_pipe command_close_bidi_pipe
                  version exec_path html_path hash_object git_cmd_try
                  remote_refs prompt
 +                get_tz_offset
+                 credential credential_read credential_write
                  temp_acquire temp_release temp_reset temp_path);