Merge pull request #9 from USGM/master

Added Email field, allowed retrieval of card data
Merge pull request #13 from USGM/master

Returned customer data now unicode instead of strings.
Revs version to 0.3.0
Make transaction params utf-8 if unicode

This commit makes sure the transaction api can handle unicode characters
in the parameters.  It converts any unicode strings to byte strings.  I
have also update the tests so that the URL comparisons do not rely on
the order of the parameters within the URL and we test for unicode
characters in the _make_call method of the transaction API
Remove un-needed import
Merge pull request #17 from nkhumphreys/master

Handle unicode in url parameters
Add the ability to send CreditCard e-mail via Auth/Capture API calls.
Merge pull request #18 from jhgg/master

Add the ability to send CreditCard e-mail via Auth/Capture API calls.
Rev version to 0.3.1
Added support for CVV when capturing/authing from a saved card.