Mongo mapper associations

[kelsin]

Howdy, at my company we wanted to be able to view embedded documents easier so i coded this up for us.

This provides two new options which (in my branch) are setup to false by default. No behavior changes occur in that situation.

If you set :mongo_mapper => { :show_associations => true } then you can see basic association information for the class and instance of mongo mapper documents. It will show up like:

"child" => embeds one Child,
"siblings" => many Sibling

If you also set :mongo_mapper => { :inline_embedded => true } than awesome_print will fully display embedded docs along with the parent like so:

"child" => embedded #<Child:0x00000> {
    blah...
}

Tests are included and the second commit was some more stub_dotfile! lines I had to add to get the tests to pass (since I had a .aprc with some indent settings).

I realize also that the mongo mapper support is very different in the development branch and wouldn't mind adding support there but it wasn't a priority right away. Also if you are not interested in having these options and support in awesome_print to begin with it wouldn't be worth doing the work right now.