Support for *.pkpasses

[booboo-at-gluga-de]

Some ticket vendors (like reservix) provide a *.pkpasses file, at least if you pay more than one ticket within one order.

PassAndroid currently seems to be unable to import this file type. Technically it's not a big thing and the workaround is easy: The pkpasses file is a ZIP file containing multiple pkpass files (one per ticket in the order). Workaround: Unzip the pkpasses file and import each single pkpass file extracted. (This worked at least for me.)

However the behavior is a significant barrier for users who are not so deep in IT related topics. Supporting direct import of *.pkpasses would be great therefore.

[ozfox]

Duplicate of https://github.com/ligi/PassAndroid/issues/503