Added customizations.

- Redefined Signature.Digest to omit exception message
    (sometimes contains non-deterministic text)
- Broadened package name for signature characterization
    (lump together multiple published versions)
- Omit uninteresting reports from dashboard stats
    (hard-coded for now to omit debug builds and crash tests)
- Added view by signature
- Set minimum version for receiving reports
- Added git settings