Spec for multiple digests (with corresponding settings, receipts)
Digests get unique identifiers.
Schema update for category filters.
Settings are separated by digest.
Receipts are separated by digests.
Updating README to include multiple digest documentation.
Merge branch 'feature/multiple-digests' into develop
Contribution and copyright year README updates.
Updating Travis configuration to use Slack instead of Campfire.
0.1.0
Merge branch 'release/0.1.0'