Convert HadoopVertex refs to FaunusVertex ones
Replace Faunus Tokens.VERSION w TitanConstants one

I removed the job jar from the Faunus meta.properties file in the last
commit, but in retrospect, this removes the need for meta.properties
altogether.  And now that Faunus/titan-hadoop is part of Titan proper,
I don't see any reason its version string should be allowed to vary
freely from the main Titan version.  This commit converts references
to Faunus's old Tokens.VERSION to references to
TitanConstants.VERSION, and it removes the Faunus meta.properties
file.