Added simple irb console with connection settings and ready to play with

examples/irb.rb

@@ -0,0 +1,19 @@
+#!/usr/bin/env ruby
+org_argv = ARGV.dup
+ARGV.clear
+
+require 'irb'
+
+$LOAD_PATH[0,0] = File.join(File.dirname(__FILE__), '..', 'lib')
+require 'mongo'
+
+include XGen::Mongo::Driver
+
+host = org_argv[0] || 'localhost'
+port = org_argv[1] || XGen::Mongo::Driver::Mongo::DEFAULT_PORT
+
+puts "Connecting to #{host}:#{port} on DB"
+DB = Mongo.new(host, port).db('ruby-mongo-examples-irb')
+
+puts "Starting IRB session..."
+IRB.start(__FILE__)