fix logger progname and add http agent name

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    fb_graph (2.1.0)
+    fb_graph (2.1.2)
       httpclient (>= 2.2.0.2)
       rack-oauth2 (>= 0.8.0)
 

VERSION

@@ -1 +1 @@
-2.1.1
+2.1.2

lib/fb_graph.rb

@@ -3,6 +3,9 @@
 require 'patch/rack/oauth2/util'
 
 module FbGraph
+  VERSION = ::File.read(
+    ::File.join(::File.dirname(__FILE__), '../VERSION')
+  )
   ROOT_URL = "https://graph.facebook.com"
 
   def self.logger
@@ -12,7 +15,7 @@ def self.logger=(logger)
     @@logger = logger
   end
   self.logger = Logger.new(STDOUT)
-  self.logger.progname = 'Paypal::Express'
+  self.logger.progname = 'FbGraph'
 
   def self.debugging?
     @@debugging

lib/fb_graph/node.rb

@@ -59,7 +59,9 @@ def delete(params = {})
     end
 
     def http_client
-      _http_client_ = HTTPClient.new
+      _http_client_ = HTTPClient.new(
+        :agent_name => "FbGraph (#{VERSION})"
+      )
       _http_client_.request_filter << Debugger::RequestFilter.new if FbGraph.debugging?
       _http_client_
     end