cool-cats: only fetch the ids to limit footprint

We don't really care much about the returned; all we want is the count
so there's no point in fetching all the category data.
cool-cats: Limit number of categories fetched

We only need to know if there is more than one category so only fetch a
maximum of two categories. The rest of the categories are all gravy.
Merge pull request #445 from Automattic/speedy-cool-cats

_s: Optimize `_s_categorized_blog()`.
_s: Formatting adjustments.

Improves readability of argument array and brings new comment in line with all other comments in this function.
_s: Update pot file.

Last update was a good three months ago and we had some string changes
since then.

Fixes #434.
_s: Resolve merge conflicts from master branch.

This also retains `$all_the_cool_cats` for some flavor. It has been
around since the initial fork of Toolbox and makes people smile:
https://twitter.com/TheFrosty/status/449581069231071232
Merge branch 'pr/437'

Conflicts:
	inc/template-tags.php
_s: Update function return values.

Adds missing documentation for `_s_categorized_blog()` and removes void
statements, in accordance with WordPress documentation guidelines.

See
http://make.wordpress.org/core/handbook/inline-documentation-standards/p
hp-documentation-standards/#phpdoc-tags