Fixes for AngularJS directive refactor (#210)
Fixes for AngularJS directive refactor (#210)

https://github.com/WickyNilliams/headroom.js/pull/202 introduced a few issues:
- `options.scroller` value got overridden due to the wrong order;
- `$document` has no method querySelector;
WickyNilliams/headroom.js,WickyNilliams/headroom.js