Add rake task for a console

Rakefile

@@ -1,4 +1,15 @@
-task :default do
+task :default => :test
+
+desc 'run the unit tests'
+task :test do
   query = File.dirname(__FILE__) << '/test/*.test.rb'
   Dir[query].each { |filename| require filename }
+end
+
+desc 'irb session with env loaded'
+task :console do
+  dir = File.dirname(__FILE__)
+  requirements = String.new
+  requirements << "-r #{dir}/test/_helper.rb"
+  system "irb #{requirements}"
 end