Moved `cfengine3-mode' to cfengine.el. Removed cfengine3.el.

Moved `cfengine3-mode' to cfengine.el.  Removed cfengine3.el.

* progmodes/cfengine.el: Moved all cfengine3.el functionality
here.  Noted Ted Zlatanov as the maintainer.
(cfengine-common-settings, cfengine-common-syntax): New functions
to set up common things between `cfengine-mode' and
`cfengine3-mode'.
(cfengine3-mode): New mode.
(cfengine3-defuns cfengine3-defuns-regex
(cfengine3-class-selector-regex cfengine3-category-regex)
(cfengine3-vartypes cfengine3-font-lock-keywords)
(cfengine3-beginning-of-defun, cfengine3-end-of-defun)
(cfengine3-indent-line): Added from cfengine3.el.