remove line forwarding code, tagger should receive a copy of stream

now that we have good carbon relays, we can do
the processing in carbon-tagger in parrallel to the rest of your
pipeline, instead of in serial.
this also makes sure that carbon-tagger doesn't break your pipe.
proper submit intervals
ignore tags
make it work again (own stats send + new elastigo api)
use godep to make sure it keeps working