Changes modal to be position absolute.

Modal should be position absolute, as it is in Foundation 5

Author: bwheeler96

template/modal/window.html

@@ -1,5 +1,5 @@
 <div tabindex="-1" class="reveal-modal fade {{ windowClass }}"
   ng-class="{in: animate}" ng-click="close($event)"
-  style="display: block; position: fixed; visibility: visible">
+  style="display: block; position: absolute; visibility: visible">
   <div ng-transclude></div>
 </div>