Fix stream limit loss count in config doc

[sjacks26]

Have the stream limit counter check the config doc to see if there's a value for the number of stream limit losses when starting a process. Right now, if a collector is restarted, that number is reset.

[sjacks26]

I think this goes in ThreadedCollector.py. See this line that updates if we lose tweets. Search for "stream_limit_loss" to see all the times that script calls that field. Github makes me think no other scripts interact with that field.