Fix images not being copied properly on Windows
Fix images not being copied properly on Windows

Absolute paths were being considered to be URLs, causing the copying
step to be skipped.

Additionally, at this point, the absolute path could potentially even
be malformed (which would otherwise be fixed during copying), making
the image not show up at all.

jhauberg/cards.py,jhauberg/cards.py,jhauberg/cards.py,jhauberg/cards.py