Moved SharkContext's static Hive fields into their own singleton object.
use blockmanager to get values in small table
use blockmanager to get values in small table updated
set storagelevel MEM_AND_DISK  and remove blocks after get values in them
set storagelevel MEMORY_AND_DISK  and remove after get values
Modify memoryBytesToString to use pattern matching, lazy contants, and displays ranges up front.

- Modify memoryBytesToString to use pattern matching, lazy contants, and displays ranges up front.
Bumped Shark version to 0.8.0-SNAPSHOT.
SHARK-92: Queries with limits will launch one task at a time.
Fix the SparkEnv null pointer exception in shark-shell.
Merge pull request #99 from JasonGiedymin/patch-1

Modify memoryBytesToString to use pattern matching, lazy contants, and d...
Merge pull request #98 from shimingfei/master

Shark-146 map join fails due to task result bigger than Akka frame size
Support dropping tables + make sure upsert has the right storage levels that reflect the cached table storage levels
More tests + small coding style fixes
Fix test, was not creating a cached table correctly
Code Review updates
Fixed the compilation error because of Spark's unpersist API change.
Bug Fix: getTableName is case sensitive whereas cached RDD key is not. Need to handle this
Spacing cleanup
Merge pull request #104 from harsha2010/droptbl

Support dropping cache tables
Better error messaging when cached table not found