Brunnhilde

- Various bug fixes
- Virus scan results now written to HTML report
- Functionality when viruses found changed to better integrate with Brunnhilde GUI

- Adds 'destination' argument for compatibility with [Brunnhilde GUI](http://github.com/timothyryanwalsh/brunnhilde-gui)

- Default clamAV virus scan (thanks to Kevin Powell)
- Optional bulk_extractor scan (thanks to Kevin Powell)
- Additional bug fixes related to spaces in file paths
- Improvements to HTML output (improved CSS/table formatting, improved provenance information and statistics, links to PRONOM format pages from tables, added bulk_extractor PII report)
- Reorganization and renaming of other file outputs
- Changed final argument from filename (e.g. "MyFolder.csv") to identifier (e.g. "MyFolder")

- Bug fix: No longer throws error when receiving filepaths with spaces as input

New features:
- Disk images (including HFS disks) can now be used as input
- Added better provenance information about scan to HTML report
- Now works with Siegfried 1.5.0

- Brunnhilde now outputs a recursive tree.txt report of source directory
- "uniqueyears" csv output now deleted after being used to generate aggregate stats for HTML report