Fix read/unread drop counter

* The counters were not updating during infinite scroll
Do not overflow allocated width

* Auto-wrap words that overflow the allocated width e.g.
http://dl.dropboxusercontent.com/u/34693557/Screenshots/cg.png
Friendly message when search returns no drops

* Display a friendly message when a drop search filter in the
river/bucket views does not return any results

* TODO: Improve the messaging to properly guide the user on
what they should do