Created payment information entity

Some items to discuss:

- Not sure if this should go to an independent module instead of commerce payment
- The payment information type bundle needs to have some kind of relationship towars the payment method, but we don't have that part (at least me) clear or developed.
- Some renaming probably needs to happen, commerce_payment_information_type was too long so I renamed to info everywhere.
- Some fields needs to be reviewed, month and year could leverage on Date somehow for example.

I'll ping on IRC for some live discussion :)
This interface should contain getDescription / setDescription methods.