Filter based on monitor tags when getting all monitors

lib/api/monitor.js

@@ -100,6 +100,7 @@ function get(monitorId, groupStates, callback){
  *    optional, an object containing any of the following
  *    * group_states: an array containing any of the following "all", "alert", "warn", or "no data"
  *    * tags: an array of "tag:value"'s to filter on
+ *    * monitor_tags: a comma separated list indicating what service and/or custom tags
  *  callback: function(err, res)
  *example: |
  *  ```javascript
@@ -128,6 +129,9 @@ function getAll(options, callback){
         if(options.tags){
             params.query.tags = options.tags.join(",");
         }
+        if(options.monitor_tags){
+            params.query.monitor_tags = options.monitor_tags.join(",");
+        }
     }
     client.request("GET", "/monitor", params, callback);
 }