update rakefile for travis

Rakefile

@@ -1,6 +1,7 @@
 #!/usr/bin/env rake
 begin
   require 'bundler/setup'
+  Bundler::GemHelper.install_tasks
 rescue LoadError
   puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
 end
@@ -11,6 +12,8 @@ rescue LoadError
   require 'rake/rdoctask'
   RDoc::Task = Rake::RDocTask
 end
+require 'rspec/core'
+require 'rspec/core/rake_task'
 
 RDoc::Task.new(:rdoc) do |rdoc|
   rdoc.rdoc_dir = 'rdoc'
@@ -19,8 +22,10 @@ RDoc::Task.new(:rdoc) do |rdoc|
   rdoc.rdoc_files.include('README.rdoc')
   rdoc.rdoc_files.include('lib/**/*.rb')
 end
-
-APP_RAKEFILE = File.expand_path("../test/dummy/Rakefile", __FILE__)
+RSpec::Core::RakeTask.new(:spec) do |spec|
+    spec.pattern = FileList['spec/**/*_spec.rb']
+end
+APP_RAKEFILE = File.expand_path("../spec/dummy/Rakefile", __FILE__)
 load 'rails/tasks/engine.rake'
 
 
@@ -37,4 +42,5 @@ Rake::TestTask.new(:test) do |t|
 end
 
 
-task :default => :test
+
+task :default => :spec