Merge branch 'normalized-urls' of https://github.com/rjgotten/less.js into 1.5.0-wip

Conflicts:
	test/css/static-urls/urls.css
	test/css/urls.css

lib/less/env.js

@@ -87,6 +87,33 @@
         return !/^(?:[a-z-]+:|\/)/.test(path);
     };
 
+    tree.evalEnv.prototype.normalizePath = function( path ) {
+        var
+          segments = path.split("/").reverse(),
+          segment;
+
+        path = [];
+        while (segments.length !== 0 ) {
+            segment = segments.pop();
+            switch( segment ) {
+                case ".":
+                    break;
+                case "..":
+                    if ((path.length === 0) || (path[path.length - 1] === "..")) {
+                        path.push( segment );
+                    } else {
+                        path.pop();
+                    }
+                    break;
+                default:
+                    path.push( segment );
+                    break;
+            }
+        }
+
+        return path.join("/");
+    };
+
     //todo - do the same for the toCSS env
     //tree.toCSSEnv = function (options) {
     //};