GIRAPH-721: Don't call progress on each edge/vertex loaded (majakabiljo)
GIRAPH-701: Communication improvement using one-to-all message
sending (Bingjing via aching)
Rest of GIRAPH-701.
GIRAPH-549
GIRAPH-722: ProgressableUtils.waitForever is not calling progress (majakabiljo)
Merge remote-tracking branch 'upstream/trunk' into trunk
InputFormat for reading from Host table. Some fixes.