Unable to integrate text editor into Moodle 2 - ckeditor

Question

I have not been able to integrate CkEditor with Moodle 2.9.1+. (I suspect the issue would apply to any text editor, not just CkEditor.)
Per the README instructions, I cloned moodle-ckeditor from https://github.com/electrolinux/moodle-ckeditor into the lib/editor directory of the moodle installation I administer.
I renamed the downloaded directory from moodle-ckeditor to ckeditor.
I added this line to config.php in the root moodle directory:
$CFG->texteditors='ckeditor,tinymce,htmlarea';
When I navigate to Admin > Plugins > Text editors > Manage editors, I only see the original 3 editors: TinyMCS HTML editor, Plain text area, and Atto HTML editor.
FWIW, when I experimentally removed "tinymce," from the shown line of config.php, it still showed up on the "Manage editors" page. That makes me think that $CFG->texteditors is not being used. I do know it is being read, because I get an error on the "Manage editors" page if I put a syntax error into that line.
I've appended a console session in case to call attention to or rule out mistakes due to typos, permissions, etc.:
[~/public_html]# grep ckeditor config.php
$CFG->texteditors='ckeditor,tinymce,htmlarea';
[~/public_html]# ls -l lib/editor
total 28
drwxr-xr-x 7 millscso millscso 4096 Jul 23 16:09 ./
drwxr-xr-x 48 millscso millscso 4096 Jul 16 02:16 ../
drwxr-xr-x 9 millscso millscso 4096 Jul 16 02:16 atto/
drwxr-xr-x 5 millscso millscso 4096 Jul 23 16:09 ckeditor/
drwxr-xr-x 7 millscso millscso 4096 Jul 23 15:59 ckeditor-/
-rw-r--r-- 1 millscso millscso 0 Jul 16 02:16 index.html
drwxr-xr-x 3 millscso millscso 4096 Jul 16 02:16 textarea/
drwxr-xr-x 9 millscso millscso 4096 Jul 16 02:16 tinymce/
Update
A few days after reverting the change to config.php, "CKEditor HTML editor" began showing up within Admin > Plugins > Text editors > Manage editors. Unfortunately, when I click on Settings [http://mills-cs.org/admin/settings.php?section=editorsettingsckeditor], I get a Section error.

Answer 1

Works for me with Moodle 2.7, here's what I did
git clone https://github.com/electrolinux/moodle-ckeditor.git
copied and pasted the folder /moodle-ckeditor/ into moodlewww/lib/editor/
renamed moodlewww/lib/editor/moodle-ckeditor/ to moodlewww/lib/editor/ckeditor/
Logged into my site and clicked on site admin -> notifications to install ckeditor
I skipped $CFG->texteditors='ckeditor,tinymce,htmlarea';
Instead went to site admin -> plugins -> editors -> manage editors then enabled ckeditor - this might be what's wrong in your case?
Then moved ckeditor up the list so it is first.
UPDATE:
I tried with an install of 2.9 and it failed because the version.php file is missing - I'm guessing this is a requirement in 2.9.
I always have the debugger on development. You might find it useful too, have these settings in config.php
// Developer settings - not for production!
error_reporting(E_ALL & ~E_STRICT);
ini_set('display_errors', 1);
$CFG->debug = E_ALL & ~E_STRICT;
$CFG->debugdisplay = true;
So I created the missing file /lib/editor/ckeditor/version.php with the contents below and it installed correctly in 2.9
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* CKEditor text editor integration version file.
*
* #package editor_ckeditor
* #copyright
* #license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
$plugin->version = 2015073000; // The current plugin version (Date: YYYYMMDDXX)
$plugin->requires = 2015051100; // Requires this Moodle version
$plugin->component = 'editor_ckeditor'; // Full name of the plugin (used for diagnostics)