Merge pull request #10 from gtarcea/issue_9_custom_rules

Resolves issue #9 with same rules with different arguments getting overwritten

Author: jmdobry

lib/schema.js

@@ -99,7 +99,7 @@ function _executeRules(options, value, key, prefix, errors, deepQueue, ruleQueue
       let rule = _this.parent.rules[ruleKey] || defaultRules[ruleKey];
       // Asynchronous rules get added to the queue
       if (rule.async) {
-        ruleQueue[ruleKey] = ((r, key, val, rVal) => {
+        ruleQueue[ruleKey + '_' + ruleValue] = ((r, key, val, rVal) => {
           return next => {
             r(val, rVal, err => {
               next(null, { err: err, key: key });