Add spaces for ga slot append

When there are more than two tests in the page, the append function for the different ga slots removes the `;` between them.
Added spaces to avoid this bug form happening.

phpab.php

@@ -120,7 +120,7 @@ private function setup_ga ()
 			}
 			elseif($auto_fail === FALSE && $async !== FALSE)
 			{
-				$this->content = substr($this->content, 0, $async - 1) . '_gaq.push(["_setCustomVar", ' . $this->ga_slot . ', "' . $this->test_name . '", "' . $this->current_variation . '", 3]);' . substr($this->content, $async);
+				$this->content = substr($this->content, 0, $async - 1) . ' _gaq.push(["_setCustomVar", ' . $this->ga_slot . ', "' . $this->test_name . '", "' . $this->current_variation . '", 3]); ' . substr($this->content, $async);
 			}
 		}
 	}