Added better compression for rules by removing the last semicolon.

lib/less/tree/ruleset.js

@@ -218,6 +218,14 @@ tree.Ruleset.prototype = {
             }
         } 
 
+        // Remove last semicolon
+        if (env.compress && rules.length) {
+            rule = rules[rules.length - 1];
+            if (rule.charAt(rule.length - 1) === ';') {
+                rules[rules.length - 1] = rule.substring(0, rule.length - 1);
+            }
+        }
+
         rulesets = rulesets.join('');
 
         // If this is the root node, we don't render