Get results from 'total events yesterday' search.

@mulby @jzoldak @brianhw @rocha 

This is predicated on a saved search in Splunk.

CC @feanil  @e0d 
Good point. The next step with this script will be for passing in searches (or abandoning the saved searches strategy and going with the 'oneshot query' strategy). So I'll plan on catching the KeyError in the next round of updates.