Rename Resque::Logger to Resque::Logging

Having both Resque.logger (which expects and stdlib Logger duck type)
and Resque::Logger is confusing.

Resque::Logging is a module that can be added to any class that wants
logging functionality. Giving it a slightly different name helps
disambiguate.

In addition, this gets rid of Resque::Logging#__log__ in favor of a
class method. Boo underscore methods!

Author: tarcieri

lib/resque.rb

@@ -10,7 +10,7 @@
 
 require 'resque/helpers'
 require 'resque/stat'
-require 'resque/logger'
+require 'resque/logging'
 require 'resque/job'
 require 'resque/worker'
 require 'resque/plugin'

lib/resque/logger.rb

@@ -0,0 +1,18 @@
+module Resque
+  # Include this module in classes you wish to have logging facilities
+  module Logging
+    module_function
+
+    # Thunk to the logger's own log method (if configured)
+    def self.log(severity, message)
+      Resque.logger.__send__(severity, message) if Resque.logger
+    end
+    
+    # Log level aliases
+    def debug(message); Logging.log :debug, message; end
+    def info(message);  Logging.log :info,  message; end
+    def warn(message);  Logging.log :warn,  message; end
+    def error(message); Logging.log :error, message; end
+    def fatal(message); Logging.log :fatal, message; end
+  end
+end

lib/resque/logging.rb

@@ -9,7 +9,7 @@ module Resque
   class Worker
     extend  Resque::Helpers
     include Resque::Helpers
-    include Resque::Logger
+    include Resque::Logging
 
     # Whether the worker should log basic info to STDOUT
     attr_accessor :verbose

lib/resque/worker.rb

@@ -1,7 +1,7 @@
 require 'test_helper'
 require 'minitest/mock'
 
-context "Resque::Logger" do
+context "Resque::Logging" do
   teardown { reset_logger }
 
   test "sets and receives the active logger" do
@@ -17,7 +17,7 @@
       mock_logger.expect severity.to_sym, nil, [message]
       Resque.logger = mock_logger
 
-      Resque::Logger.send severity, message
+      Resque::Logging.send severity, message
       mock_logger.verify
     end
   end