Update Spark to 0.8.1 and add hadoop2.2 profile

This upgrades the Spark version to 0.8.1 and adds a hadoop22 maven profile that fixes issues with connecting to Hadoop 2.2 clusters.

To make that work we added updated google-protobuf and akka dependencies.  The regular build leaves these dependencies off, even though the default hadoop.version was 2.2  Not sure if anyone actually had that working though.

However, the filesystem filter in adam-cli/pom.xml applies to all builds to fix the error: "No Filesystem found for scheme: hdfs" but after this addition, the local file paths throw an error.  

Not ready to be merged then, I just wanted to put this out there so any else could see what was necessary to get ADAM working on hadoop2.2 cluster