$ bundle exec irb
Invalid gemspec in [/home/petro/.rvm/gems/ree-1.8.7-2012.02/specifications/ZenTest-4.11.0.gemspec]: Illformed requirement ["< 3.0, >= 1.8"]
Invalid gemspec in [/home/petro/.rvm/gems/ree-1.8.7-2012.02/specifications/ZenTest-4.11.0.gemspec]: Illformed requirement ["< 3.0, >= 1.8"]
Invalid gemspec in [/home/petro/.rvm/gems/ree-1.8.7-2012.02/specifications/ZenTest-4.11.0.gemspec]: Illformed requirement ["< 3.0, >= 1.8"]
ree-1.8.7-2012.02 :001 > require 'mongomatic'
      ** Notice: The native BSON extension was not loaded. **

      For optimal performance, use of the BSON extension is recommended.

      To enable the extension make sure ENV['BSON_EXT_DISABLED'] is not set
      and run the following command:

        gem install bson_ext

      If you continue to receive this message after installing, make sure that
      the bson_ext gem is in your load path.

 => true
ree-1.8.7-2012.02 :002 >