rails4: trying to fix the Rakefile.

For the moment, 'rake spec' returns 0 for failing specs. Therefore, travis shows green even when specs are failing. This has to be fixed.

rspec/rspec-rails#1016

Rakefile

@@ -5,16 +5,22 @@
 require File.expand_path('../config/application', __FILE__)
 require 'rspec/core/rake_task'
 
-task :default => :spec
-
 Wingolfsplattform::Application.load_tasks
 
-Rake::Task[ :spec ].clear
 
+# The task `rake spec` is defined by the rspec-rails gem.
+# We have to customize it here in order to include the your_platform engine.
+# 
+# For more information on how to customize the task, see:
+#   * https://github.com/rspec/rspec-rails#customizing-rake-tasks
+#   * https://www.relishapp.com/rspec/rspec-core/docs/command-line/rake-task
+#
+Rake::Task[ :spec ].clear
 RSpec::Core::RakeTask.new( :spec ) do |t|
   t.pattern = "{./spec/**/*_spec.rb,./vendor/engines/**/spec/**/*_spec.rb}"
+  t.fail_on_error = true
 end
 
-
-
-
+# The default rake task, i.e. when running just `rake`, is `rake spec`.
+#
+task :default => :spec