Landing pull request 476. Fix lint complaints about unescaped -. Foll…

…ow up to #10021 Fixes #10021.

More Details:
 - #476
 - http://bugs.jquery.com/ticket/10021

src/css.js

@@ -6,7 +6,7 @@ var ralpha = /alpha\([^)]*\)/i,
 	rupper = /([A-Z]|^ms)/g,
 	rnumpx = /^-?\d+(?:px)?$/i,
 	rnum = /^-?\d/,
-	rrelNum = /^([-+])=([-+.\de]+)/,
+	rrelNum = /^([\-+])=([\-+.\de]+)/,
 
 	cssShow = { position: "absolute", visibility: "hidden", display: "block" },
 	cssWidth = [ "Left", "Right" ],