GIRAPH-311:  Master halting in superstep 0 is ignored by workers (majakabiljo)
GIRAPH-698: Expose Computation to a user (aching)
GIRAPH-676: A short tutorial on getting started with Giraph
GIRAPH-702: Fix multithreaded output (majakabiljo)
GIRAPH-703: create an appropriate way to generate the options.html page
using maven.
GIRAPH-703: create an appropriate way to generate the options.html page using maven.
Merge remote-tracking branch 'origin/trunk' into jython-vertex