Bumping Java version to 1.7
Updating ephemeral HDFS w/ new HDFS structures
Updating persistent-hdfs accordingly
Adding seperate MapReduce directory
Some fixes for mapreduce
Telling spark to look for native Hadoop files
Adding AMI information
Enabling short-curcuit reads in HDFS
Bumping AMI version
Reverting short circuit read change
Adding --delete to copy-dir
dfs.block.size --> dfs.blocksize
Adding block size to mapreduce configuration
Adding HDFS site to Spark
us-east --> us-east-1
Adding script which performs automatic AMI copies
Adding verification that image is public
Removing  shortcut
Reverting --delete change
Merge pull request #6 from shivaram/master

Ganglia and persistent hdfs fixes