Bundle thin gem for production / Heroku.
Add Procfile to direct Heroku to use thin.
Output cache timeout when RSS updates in RSSCache.
Log if RSSCache is updated Just In Time (JIT).
Log exceptions raised in RSSCache Thread loop.
Sync stdout/stderr to ensure buffers are flushed.

Logs weren't making it to Logentries in real time. Forcing the buffers
to be flushed should allow this to happen.