refactor middleware class name

lib/mixpanel.rb

@@ -1,2 +1,2 @@
 require 'mixpanel/mixpanel'
-require 'mixpanel/middleware'
+require 'mixpanel/mixpanel_middleware'

lib/mixpanel/middleware.rb → lib/mixpanel/mixpanel_middleware.rb

@@ -1,6 +1,6 @@
 require 'rack'
 
-class Middleware
+class MixpanelMiddleware
   def initialize(app, mixpanel_token)
     @app = app
     @token = mixpanel_token

spec/mixpanel/middleware_spec.rb → spec/mixpanel/mixpanel_middleware_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Middleware do
+describe MixpanelMiddleware do
   include Rack::Test::Methods
 
   describe "Dummy apps, no text/html" do

spec/support/rack_apps.rb

@@ -1,5 +1,5 @@
 def setup_rack_application(application, options = {})
-  stub!(:app).and_return(Middleware.new(application.new(options), MIX_PANEL_TOKEN))
+  stub!(:app).and_return(MixpanelMiddleware.new(application.new(options), MIX_PANEL_TOKEN))
 end
 
 def html_document