gistfile1.txt

Thanks for the pull request! Before I can pull it though, two things need changed:

Tests! A lot of people are using MongoMapper, so we want to make sure we don't break this in the future.
I don't like manually deleting the options for the connection string. What do you think about having driving options nested with the other connection settings? Something like:
MongoMapper.config = {'development' => {:port => 12345, :options => {:pool_size => 5}}