* Disable broken Facebook max_loop. As for Twitter, we need to handle this properly. Putting up traps (workarounds) in the code will only make this harder, longterm.
* Retrieve content-type from actual HTTP headers when importing attachments.
* Don't add attachment if it couldn't be retrieved.
Merge pull request #87 from muesli/master

Fix for #85 - read attachment's content-type from HTTP headers