show favicon notifications for unread chat messages
Add chat messages even when the image load fails.

Some bots send images as URIs rather than base64, which can result in
them not loading properly, either due to dead links or HTTPS cert
problems. In such cases, I think its better to display the imageless
message anyway, instead of just having the client drop it entirely.
Merge pull request #150 from tec27/dead_images

Add chat messages even when the image load fails.
Merge pull request #148 from fsbdev/notifications

show favicon notifications for unread chat messages
Fix slashme links that end the message and contain a trailing slash
Merge pull request #151 from imakewebthings/slashme-links

Fix slashme links that end the message and contain a trailing slash