Adding a feature to expand screencast.com tiny image links into inline images

Hey Eric,

I'm not sure if this feature is really desired outside TechSmith's walls, but I thought I'd post it to you and see if you wanted to include it in Kindling.

To summarize, it'll take screencast.com tiny urls and transform the hyperlink representation of them in the campfire chat into images similar to how campfire inlines .png's and .jpg's. Turning the option back off restores the hyperlinks as they were. Note that this should support hyperlinks that exist in the middle of text as well.

Nice work on the plugin by the way, I use it all the time!