Djangoshop-stripe

* Fixed: Compute amount in correct currency using Order object instead of defaulting.

* Upgrade to ``stripe`` version 1.53 and ``angular-stripe`` version 4.2.13.

* Replace ``{% addtoblock "ext-js" %}`` against ``{% addtoblock "js" %}``, since Django-SHOP 0.10.0
can handle externally referenced files as well.

* Adopted for django-SHOP version 0.10. Do not use this version for Django-SHOP 0.9.x.
* Stripe form template can be used by static views, rendering the PaymentMethodForm manually.

* Replaced ``bower`` against ``npm``.
* Replaced Sekizai block ``shop-ng-requires`` against ``ng-requires``.
* Replaced Sekizai block ``shop-ng-config`` against ``ng-config``.
* Since Ben Drucker is [unwilling](https://github.com/bendrucker/angular-stripe/issues/50) to
provide an installable ``angular-stripe.js`` module, it is build and shipped with
**djangoshop-stripe**.

Fixed Python3 compatibility issue.