My trial task implementation

Thats it.
P.S. To run specs run rake ``db:seed RAILS_ENV=test`` first

I could take factory_girl for specs, but it would take a little more time, so I just use seed data for both specs and application. 

It might also worth spending some time, investigating what data should be treated as successful, failed and disputed. But I decided just to create status field.

And specs are pretty primitive right now, but I believe that's enough to provide quick results to customer.