Stack trace on scalatest failures
Added the initial functionality to convert RDDs into Shark in-memory tables.
Error handling for RDDTable.
further prune column for TachyonTableRDD
Merge branch 'master' of github.com:amplab/shark into ampmaster
1. rename addColumnPruneInfo to be pushDownColumnPruning. 2. let TablePartition ignore null ByteBuffer in prunediterator.
Add DictEncoding support for Int and Long. 32K uniques using Shorts for encoding
Spark package rename (spark -> org.apache.spark).
Merge pull request #142 from amplab/tachyon

further prune column for TachyonTableRDD
Try to fix configuration problem for user
Changed spark package in ci script.
Merge pull request #143 from rxin/rename

Spark package rename (spark -> org.apache.spark).
Merge pull request #144 from pwendell/exception

Try to fix configuration problem for user
Updated sbt project setting for assembly target.
Add some misc. comments in TableScanOperator.
Merge branch 'master' of git://github.com/amplab/shark

Conflicts:
	src/main/scala/shark/execution/TableScanOperator.scala
Comments for MemoryMetadataManager::unpersist()
Update some misc comments for TableScanOperator/MetadataManager
Merge pull request #145 from harveyfeng/partition-caching

Some misc. comments in TableScanOperator and MemoryMetaDataManager
Merge branch 'master' of github.com:amplab/shark into ampmaster