Add third_party/pexpect

third_party/pexpect/doc/index.rst

+Pexpect version |version|
+=========================
+
+.. image:: https://travis-ci.org/pexpect/pexpect.png?branch=master
+   :target: https://travis-ci.org/pexpect/pexpect
+   :align: right
+   :alt: Build status
+
+Pexpect makes Python a better tool for controlling other
+applications.
+
+Pexpect is a pure Python module for spawning child applications;
+controlling them; and responding to expected patterns in their output.
+Pexpect works like Don Libes' Expect. Pexpect allows your script to
+spawn a child application and control it as if a human were typing
+commands.
+
+Pexpect can be used for automating interactive applications such as
+ssh, ftp, passwd, telnet, etc. It can be used to a automate setup
+scripts for duplicating software package installations on different
+servers. It can be used for automated software testing. Pexpect is in
+the spirit of Don Libes' Expect, but Pexpect is pure Python. Unlike
+other Expect-like modules for Python, Pexpect does not require TCL or
+Expect nor does it require C extensions to be compiled. It should work
+on any platform that supports the standard Python pty module. The
+Pexpect interface was designed to be easy to use.
+
+Contents:
+
+.. toctree::
+   :maxdepth: 2
+
+   install
+   overview
+   api/index
+   examples
+   FAQ
+   commonissues
+   history
+
+Pexpect is developed `on Github <http://github.com/pexpect/pexpect>`_. Please
+report `issues <https://github.com/pexpect/pexpect/issues>`_ there as well.
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`
+