(bug 32450) MediaWiki: .js|.css pages parsed [[Category:#]] links

(bug 32450) MediaWiki: .js|.css pages parsed [[Category:#]] links

This patch skip the [[Category:#]] parsing logic when the Title is in
NS_MEDIAWIKI and ends with .js or .css. This way the code is kept as is
and pages are no more categorized.

How to reproduce the issue:

	$ echo 'var foo = "[[Category:bug32450]]"' \
	| php maintenance/parse.php --title MediaWiki:Foobar.js
	<p>var foo = ""
	</p>
	$

Note how the text got stripped.

After this patch:

	$ echo 'var foo = "[[Category:bug32450]]"' \
	| php maintenance/parse.php --title MediaWiki:Foobar.js
	<p>var foo = "[[Category:bug32450]]"
	</p>
	$

TEST PLAN:
==========

$ php parserTests.php --quiet
This is MediaWiki version 1.19alpha (r103473).

Reading tests from "tests/parser/parserTests.txt"...
Reading tests from "tests/parser/extraParserTests.txt"...
Passed 654 of 654 tests (100%)... ALL TESTS PASSED!
$