Several changes; read below.

[YOMorales]

Here are the changes done:

1. Transforming a Model's $order attribute from a string to an array, so that it gets set (addresses the issue brought here: https://github.com/ichikaway/cakephp-mongodb/issues/20).
2. Adds the ability to set update operators (using mongoNoSetOperator) on findAndModify queries (i.e. 'De-hardcodes' the '$set' parameter).
3. Makes the 'created' and 'modified' keys optional: if $mongoSchema is defined without these keys, they won't be added.
   (Sometimes one doesn't need these keys and wishes to eliminate them to improve performance a bit, but the MongoDB Datasource kept adding them no matter what).

[d1rk]

Very nice work - would love to see that pulled. Give it a go, ichi.

[ichikaway]

Thanks.

(1)
I made the patch for issue #20.
f0d296b

(2)
merge your patch :)

(3)
It's better to merge _id key of default schema into mongoSchema property.
b63d131
My patch filters created and modified keys.