fix #31 and #406

Conflicts:

	lib/less/parser.js

Author: revolunet

lib/less/parser.js

@@ -974,9 +974,9 @@ less.Parser = function Parser(env) {
 
                 if (c === '>' || c === '+' || c === '~') {
                     i++;
-                    while (input.charAt(i) === ' ') { i++ }
+                    while (input.charAt(i).match(/\s/)) { i++ }
                     return new(tree.Combinator)(c);
-                } else if (input.charAt(i - 1) === ' ') {
+                } else if (input.charAt(i - 1).match(/\s/)) {
                     return new(tree.Combinator)(" ");
                 } else {
                     return new(tree.Combinator)(null);