Add out_wendelin_formatted plugin

Used to upload data to wendelin in different format than default fluentd msgpack stream. For example sending text data as is using single_value formatter

lib/fluent/plugin/out_wendelin_formatted.rb

+# Fluentd output plugin to ingest data to Wendelin system
+# Copyright (C) 2015  Nexedi SA and Contributors.
+#                     Kirill Smelkov <kirr@nexedi.com>
+#
+#   This program is free software: you can Use, Study, Modify and Redistribute
+#   it under the terms of the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+
+# This plugin hooks into Fluentd in a way similiar to out_forward and
+# out_secure_forward and outputs event stream to a Wendelin HTTP endpoint.
+
+require 'fluent/plugin/formatter'
+require_relative 'out_wendelin'
+
+
+module Fluent::Plugin  
+  class WendelinOutputFormatted < WendelinOutput
+    Fluent::Plugin.register_output('wendelin_formatted', self)
+	
+	helpers :formatter
+	
+	config_section :format do
+	  config_set_default :@type, 'single_value'
+	end
+	
+    def configure(conf)
+        super
+		@formatter = formatter_create
+	end
+
+    def formatted_to_msgpack_binary?
+      @formatter_configs.first[:@type] == 'msgpack'
+    end
+
+	def format(tag, time, record)
+        @formatter.format(tag, time, record)
+	end
+	
+	def write(chunk)
+	  super
+	end
+  
+  end
+
+end