Better construction for EDC and powertrack streams.

Call like:
        final GnipStream stream = f.createStream("acme", "stream", observer);
should be replaced with
        final GnipStream stream = f.createPowertrackStream()
            .withAccount("acme")
            .withType("twitter")
            .withObserver(observer)
            .build();

It is easier to create Enterprise Data collector streams, and can be used
with feed which formats are both Normalize to Activity Streams (atom) and
And Leave data in its original format  (atom and json)
Agregamos soporte para lineas vacias en ByLineFeedProcessor.
se estaba usando la variable incorrecta
Correcion formato.
typo
Facebook feeds sometimes have a favoriteCount attribute that is empty