wide mode with default theme

[jflalande]

I think there is an issue with the wide mode.

The command:

darkslide --mod=wide16x9 -i -t default hello.rst

works fine: it produces slides in 16:9 ratio.

But, when removing the -i option (for embed css and images), the aspect ratio returns to 4:3:

darkslide --mod=wide16x9 -t default hello.rst

I just tested with a short rst file and with the default theme I copied from the python package.