Add in support for ac-php / a company backend

[cyrialize]

I'm an avid user of https://github.com/xcwen/ac-php, specifically company-php. I think it'd be a great idea to include this package into php-suite since it has code completion, documentation popups (via company-quickhelp), and jumping back and forth from function definitions.

I believe that https://github.com/emacs-php/phpactor.el does all of the above, so I understand if ac-php is not included.

[zonuexe]

Thanks for the suggestion.

I do not have enough time yet, but I'd like to design it as an integrated interface including those packages.

[cyrialize]

I'd be definitely willing to help out! I'm very happy that something like emacs-php exists - since I use php and emacs everyday at work. Once my elisp is up to snuff (I barely know any), I plan to provide a helping hand.

[ejmr]

@jonnycyr Thank you for offering to help out. You do not need to be a master of Elisp ahead of time. Plenty of things in PHP Mode and PHP-related packages for GNU Emacs would benefit from extra documentation. You could start there, since in order to write that documentation you would have to understarnd the code in question, by necessity.