Use an alternative way to detect image

When parsing content to retrieve images to save locally, we only check for the content-type of the image response.
In some case, that value is empty.
Now we’re also checking for the first few bytes of the content as an alternative to detect if it’s an image wallabag can handle.
We might get higher image supports using that alternative method.

1 files changed, 0 insertions, 0 deletions

diff --git a/tests/Wallabag/CoreBundle/fixtures/image-no-content-type.jpg b/tests/Wallabag/CoreBundle/fixtures/image-no-content-type.jpg
new file mode 100644
index 00000000..0c60e952
--- /dev/null
+++ b/tests/Wallabag/CoreBundle/fixtures/image-no-content-type.jpg