Merge pull request #83 from tiagohillebrandt/master

Verifies if exec is not in disable_functions directive

lib/cli/Shell.php

@@ -37,7 +37,7 @@ static public function columns() {
 						break;
 					}
 				}
-			} else {
+			} else if (!preg_match('/(^|,)(\s*)?exec(\s*)?(,|$)/', ini_get('disable_functions'))) {
 				$columns = (int) exec('/usr/bin/env tput cols');
 			}