Merge pull request #239 from jawallace/master

TskDbDiff Module
Updated script comments to describe what it does
Fix bug when free disk space during ingest cannot be detected as is reporting 0 (on some network file systems) and ingest is stopped
Merge pull request #242 from adam-m/master

Fix bug when free disk space during ingest cannot be detected as is repo...
Initial change from gstreamer to vlc