Fix auto loading TrackRequest middleware

lib/application_insights.rb

@@ -2,4 +2,8 @@ require_relative 'application_insights/telemetry_client'
 require_relative 'application_insights/unhandled_exception'
 require_relative 'application_insights/version'
 
-autoload :TrackRequest,               "application_insights/rack/track_request"
+module ApplicationInsights
+  module Rack
+    autoload :TrackRequest,               "application_insights/rack/track_request"
+  end
+end

lib/application_insights/rack/track_request.rb

@@ -1,9 +1,9 @@
 require 'rack'
-require 'securerandom'
 require_relative '../channel/contracts/request_data'
 require_relative '../telemetry_client'
 
 module ApplicationInsights
+  module Rack
     # Track every request and sends the request data to Application Insights.
     class TrackRequest
       # Initializes a new instance of the class.
@@ -41,7 +41,7 @@ module ApplicationInsights
           @client = TelemetryClient.new  @instrumentation_key, channel
         end
 
-      request = Rack::Request.new env
+        request = ::Rack::Request.new env
         id = rand(16**32).to_s(16)
         start_time = start.iso8601(7)
         duration = format_request_duration(stop - start)
@@ -80,4 +80,5 @@ module ApplicationInsights
         Time.at(duration_seconds).gmtime.strftime("0:%H:%M:%S.%7N")
       end
     end
+  end
 end

lib/application_insights/telemetry_client.rb

@@ -167,7 +167,7 @@ module ApplicationInsights
     # @param [Hash] options the options to create the {Channel::Contracts::EventData} object.
     # @option options [Hash] :properties the set of custom properties the client wants attached to this
     #   data item. (defaults to: {})
-    def track_trace(name, severity_level = nil, options={})
+    def track_trace(name, severity_level = Channel::Contracts::SeverityLevel::INFORMATION, options={})
       data_attributes = {
           :message => name || 'Null',
           :severity_level => severity_level || Channel::Contracts::SeverityLevel::INFORMATION,

test/application_insights/rack/test_track_request.rb

@@ -3,7 +3,7 @@ require 'rack/mock'
 require_relative '../mock_sender'
 require_relative '../../../lib/application_insights/rack/track_request'
 
-include ApplicationInsights
+include ApplicationInsights::Rack
 
 class TestTrackRequest < Test::Unit::TestCase
   def test_call_works_as_expected