Update helpers.php
Update helpers.php

A patch for when people are using nginx (or any other webserver) instead of apache to serve Taskboard. This adds an helper function from php.net and replaces the apache_ functions with the generic getallheaders, that is supported since php 5.3.
jeremiahmarks/TaskBoard,woodworker/TaskBoard,oh-em-gee/TaskBoard,vinnugaa/TaskBoard,wangjun/TaskBoard,ZM-git/TaskBoard,ashwinrayaprolu1984/TaskBoard,momo-aux/TaskBoard,momo-aux/TaskBoard,kiswa/TaskBoard,vinnugaa/TaskBoard,kiswa/TaskBoard,woodworker/TaskBoard,kiswa/TaskBoard,woodworker/TaskBoard,wangjun/TaskBoard,ashwinrayaprolu1984/TaskBoard,ZM-git/TaskBoard,oh-em-gee/TaskBoard,HernanFaustino/ProjectsBoard,HernanFaustino/ProjectsBoard,ashwinrayaprolu1984/TaskBoard,oh-em-gee/TaskBoard,ashwinrayaprolu1984/TaskBoard,ZM-git/TaskBoard,jeremiahmarks/TaskBoard,ganquan0910/TaskBoard,jeremiahmarks/TaskBoard,wangjun/TaskBoard,oh-em-gee/TaskBoard,momo-aux/TaskBoard,woodworker/TaskBoard,vinnugaa/TaskBoard,jeremiahmarks/TaskBoard,ganquan0910/TaskBoard,kiswa/TaskBoard,HernanFaustino/ProjectsBoard,wangjun/TaskBoard,vinnugaa/TaskBoard,momo-aux/TaskBoard,kiswa/TaskBoard,ganquan0910/TaskBoard,HernanFaustino/ProjectsBoard,ZM-git/TaskBoard,ganquan0910/TaskBoard