Remove offset dependency from css. Move curCSS and getStyles to their own modules. -39 bytes. Close gh-1360.

src/css/var/getStyles.js

@@ -0,0 +1,5 @@
+define(function() {
+	return function( elem ) {
+		return elem.ownerDocument.defaultView.getComputedStyle( elem, null );
+	};
+});

src/css/var/rmargin.js

@@ -0,0 +1,3 @@
+define(function() {
+	return (/^margin/);
+});

src/css/var/rnumnonpx.js

@@ -0,0 +1,5 @@
+define([
+	"../../var/pnum"
+], function( pnum ) {
+	return new RegExp( "^(" + pnum + ")(?!px)[a-z%]+$", "i" );
+});