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...