Support image URLs which don't directly point to file.

With the introduction of extractor functions we can rewrite the URLs so
that we obtain the actual URL.

Signed-off-by: Michael Markert <markert.michael@googlemail.com>
Merge pull request #5 from cofi/extractor-functions

Support image URLs which don't directly point to file.
render gifs
default to not-scale
svg
I'm stupid
Replace stray paren.

Signed-off-by: Michael Markert <markert.michael@googlemail.com>
Only try to download if a URL was extracted successfully.

`url-queue-retrieve' was called unconditionally on `dl'.

Signed-off-by: Michael Markert <markert.michael@googlemail.com>