Add masonry and masonry-brick classes for backwards compatibility.
Use jQuery to set classes in v2 compatibility shim, also use _itemize for adding the masonry-brick classes.
Masonry v2 back-compat improvements.

* Use setTimeout to add the `masonry` class, change priorities
* Change priorities when adding the `masonry-brick` class during `_itemize()`
* Add v2 compatibility with `destroy()` which removes `masonry` and `masonry-brick` classes
Merge branch 'master' of https://github.com/kovshenin/masonry into v2-fixes

Conflicts:
	examples/js/masonry-v2-shim.js
shim refactoring