Added support for php+-mode

[mgallego]

Added a hook to php+-mode (https://github.com/echosa/phpplus-mode)

[illusori]

Thanks for the patch, released to GitHub and Marmalade as v1.0.5. :)

I tweaked the hook add to be local, should be fine, let me know if it's a problem.

[arnested]

Actually you tweaked the hook to append and not to add locally. But that is just fine and the way it should be and is done for `php-mode' as well :-)

[illusori]

Uh, yes, that's what I meant, I always manage to get that arg confused, even when I read the definition. I know what I'm doing, honest!