Add cache invalidation when updating a term, example: create a category, assign it to a post, edit the category. Currently, the post's term cache is not updated. When updating terms in a given taxonomy, invalidate the object term caches linked to that taxonomy. 

Introduce `get_taxonomy_last_changed()`, `set_taxonomy_last_changed()`, and `post_taxonomy_is_fresh()`.

`post_taxonomy_is_fresh()` is only called in `get_object_term_cache()` - at which point the taxonomy's `last_changed` value is checked against the post's `{$taxonomy}_last_changed` value.

`set_taxonomy_last_changed()` is called whenever directory database queries are made that insert new terms or affect existing terms.

Fixes #22526.


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git-svn-id: http://core.svn.wordpress.org/trunk@26970 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Regenerate the term hierarchy cache (`{taxonomy}_children`) when it is out of sync with the passed taxonomy's `last_changed` value.

Introduces `taxonomy_hierarchy_is_fresh()`, which is only called in `_get_term_hierarchy()`. The taxonomy's `last_changed` value is checked against the value of `wp_cache_get( 'hierarchy_last_changed', $taxonomy )`.

Adds a unit test - `Tests_Term:test_hierachy_invalidation()`.

See [27101], which makes this type of cache invalidation possible.
Fixes #14485.


Built from https://develop.svn.wordpress.org/trunk@27102


git-svn-id: http://core.svn.wordpress.org/trunk@26971 1a063a9b-81f0-0310-95a4-ce76da25c4cd
JSHint fixes for media-views and Gruntfile.

props gcorne.
fixes #27032, #27033.

Built from https://develop.svn.wordpress.org/trunk@27105


git-svn-id: http://core.svn.wordpress.org/trunk@26972 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Merge colors.css into wp-admin.css. Non-default color schemes became overloads rather than swaps in the 3.8 redesign. Benefits include:

* No more border-width, border-style, border-color insanity.
* Point releases are much less likely to require extra finagling to avoid rebuilding the color schemes.
* Yours truly has a better overall vision of ~14,000 lines of admin CSS and where we go from here.

1,065 net lines of red, y'all.
props helen, jorbin. fixes #18380.

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git-svn-id: http://core.svn.wordpress.org/trunk@26973 1a063a9b-81f0-0310-95a4-ce76da25c4cd