Support for r3 instance types.

Amazon's new r3 instances come without EXT3-formatted drives. This patch
adds a workaround that detects this situation and formats the drives
as ext3.

Hopefully this will be subsumed later if anyone wants to pick up
SPARK-1079.
Using XFS instead of ext3
Small fix
Merge pull request #54 from pwendell/v2

Add support for r3 instances
Porting ext4 changes into v2 branch
add spark-0.9.2 to v2
Merge pull request #61 from mengxr/spark-0.9.2-v2

add spark-0.9.2 to v2
map shark-0.9.2 to shark-0.9.1
Merge pull request #62 from mengxr/shark-fix

map shark-0.9.2 to shark-0.9.1
HOTFIX: Adding Spark 1.1.0
BUGFIX: Remove extra * in Spark init script
Merge pull request #68 from pwendell/v2

BUGFIX: Remove extra * in Spark init script
Merge remote-tracking branch 'upstream/v2' into v2

Conflicts:
	spark/init.sh