Issue #6: Invoking CKEditor the same way Sendy does

I copied/pasted the `<script>` calls from within Sendy's create.php
file into all the pages that use the editor. I also removed the
javascript that toggled HTML, since CKEditor can take care of that
for us.
Issue #6: I missed the WYSIWYG toggle here

template_create.php had the js to toggle the wysiwyg
editor, and I had missed it.
Issue #6: Missed the old editor javascript in templates.php

Copied the calls to CKEditor into this file, as well.

Signed-off-by: Elliot V <elliotfriend@gmail.com>
Issue #6: I forgot to add CKEditor to edit-template.php

I can't believe I forgot to add the javascript in this file to
include CKEditor. I had put the editor in within our Sendy
installation, but forgot to duplicate the fix here in my local
dev copy. Sorry about that, everyone!

Signed-off-by: Elliot V <elliotfriend@gmail.com>
Merge pull request #7 from ElliotFriend/ckeditor-not-invoked

Issue #6: Added calls to ckeditor to use the new WYSIWYG interface