Changed Spark version to 0.7.2 so it can be pulled from Maven.
Changed Spark version to 0.7.2 so it can be pulled from Maven.

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