Solution fixes

2015/solutions.php

@@ -1,10 +1,10 @@
 <?php
 
-$days = glob('./days/*.php');
+$days = glob("./2015/days/*.php");
 foreach ($days as $day) {
   require($day);
 }
 
-$day1 = day1solution1();
-$day1b = day1solution1b();
+$d1 = day1solution1();
+$d1b = day1solution1b();