shark-env.sh config file change for SIGMOD demo.
shark-env.sh config file change for SIGMOD demo.

vax11780/shark,alabid/blinkdb,alabid/blinkdb,sameeragarwal/blinkdb,lzshlzsh/shark,vax11780/shark,alabid/blinkdb,mattyb149/blinkdb,amplab/shark,sameeragarwal/blinkdb,sameeragarwal/blinkdb,vax11780/shark,amplab/shark,sjyk/sampleclean,sjyk/sampleclean,mapr/shark,mattyb149/blinkdb,lzshlzsh/shark,sjyk/sampleclean,mapr/shark,lzshlzsh/shark,sameeragarwal/blinkdb_dev,sameeragarwal/blinkdb_dev,mapr/shark,mattyb149/blinkdb,sameeragarwal/blinkdb_dev,amplab/shark