Issue #279: Ignore snapshots without meta file

This may be because of a failed snapshot, or one that is currently running.
Merge pull request #317 from ambiata/topic/snapshot-ignore-empty

Issue #279: Ignore snapshots without meta file
Switch ivory-cli to use hadoop-dev for now
Merge pull request #312 from ambiata/topic/ivory-fast-cli

Don't use hadoop jar for running ivory cli tests
Add profiling to squash