add tests for mongo.
working base mongo tests config. still  have problem with hash fields.
add tests for mongo.
working base mongo tests config. still  have problem with hash fields.
use custom object type.
Merge branch 'mongo-tests' of git://github.com/Payum/PaypalExpressCheckoutNvp into mongo-tests
plug dependencies required for test

(cherry picked from commit b162294934bead31c5f2d2b7fd08bff7eca7c4ab)

Conflicts:
	composer.json
fix mongo mapping.
Merge pull request #11 from Payum/mongo-tests

[WIP] add tests for mongo.