Improve rake spec task.

Rakefile

@@ -9,9 +9,26 @@ task :serve_fixtures do
   exec "rackup -s webrick ./Spec/fixtures/config.ru"
 end
 
+def is_fixture_server_running?
+  require 'socket'
+  TCPSocket.new('localhost', 9292)
+  true
+rescue Errno::ECONNREFUSED
+  false
+end
+
 desc "Run the specs"
 task :spec do
-  exec "ruby #{File.expand_path('../vendor/NuBacon/bin/nu-bacon.rb', __FILE__)} --project iTrakt.xcodeproj --target Specs"
+  ios_sim = `which ios-sim`.strip
+  if ios_sim.empty?
+    puts "[!] Unable to find `ios-sim'. Install it with: $ brew install ios-sim"
+    exit 1
+  elsif !is_fixture_server_running?
+    puts "[!] It seems the fixture server isn't running. Start it with: $ rake serve_fixtures"
+  else
+    sh "xcodebuild -project iTrakt.xcodeproj -target Specs -configuration Debug -sdk iphonesimulator4.2"
+    exec "#{ios_sim} launch build/Debug-iphonesimulator/Specs.app"
+  end
 end
 
 task :default => :spec