add infrastructure.search api

lib/api/index.js

@@ -3,7 +3,8 @@ var api = {
     metric: require("./metric"),
     event: require("./event"),
     serviceCheck: require("./serviceCheck"),
-    user: require("./user")
+    user: require("./user"),
+    infrastructure: require("./infrastructure")
 };
 
 module.exports = function(obj){

lib/api/infrastructure.js

@@ -0,0 +1,36 @@
+var client = require("../client");
+
+/*section: infrastructure
+ *comment: |
+ *  search for metrics or hosts
+ *params:
+ *  query: |
+ *    the query to use for search see [datadog docs](http://docs.datadoghq.com/api/#search)
+ *    for examples of the query (e.g. "hosts:database", "metrics:system" or "test")
+ *  callback: function(err, res)
+ *example: |
+ *  ```javascript
+ *  var dogapi = require("dogapi");
+ *  var options = {
+ *    api_key: "api_key",
+ *    app_key: "app_key"
+ *  };
+ *  dogapi.initialize(options);
+ *  dogapi.infrastructure.search("hosts:database", function(err, res){
+ *    console.dir(res);
+ *  });
+ *  ```
+ */
+function search(query, callback){
+    var params = {
+        query: {
+            q: query
+        }
+    };
+
+    client.request("GET", "/search", params, callback);
+}
+
+module.exports = {
+    search: search
+};