Update Sizzle: rewrite attributes handling to be simpler and more widespread...

Update Sizzle: rewrite attributes handling to be simpler and more widespread when independent from jQuery. No changes to jQuery's attribute handling.

sizzle @ 6da25afc

-Subproject commit b66a748cd7ffe70962ed02d1d32cb6c22c3e82d9
+Subproject commit 6da25afc2cab38c769e7de0b71411eb761c3c33e

src/sizzle-jquery.js

 // Override sizzle attribute retrieval
 Sizzle.attr = jQuery.attr;
-Sizzle.selectors.attrMap = {};
 jQuery.find = Sizzle;
 jQuery.expr = Sizzle.selectors;
 jQuery.expr[":"] = jQuery.expr.filters;