Initial commit to enable parallel crypto verification
Allow configuration to choose which backends can be used to verify a certificate.
Detect which verification backend to run on a particular message  For issue #209
Fix validate to use modified copy of cfg.
Merge branch 'release/0.7.4' into develop
Use an empty string here instead of None.
Avoid raising an exception here.
Merge pull request #211 from fedora-infra/feature/ease-up-on-the-exception

Avoid raising an exception here.
Update status doc.
Some updates to the topology diagram.
Add fmn to the topology diagram.
Build of the topology doc.
Merge pull request #212 from fedora-infra/feature/updated-status

Feature/updated status
Blame the right project for JSON format
Merge pull request #213 from fedora-infra/logger-doc

Blame the right project for JSON format
Only output if there is something to output.
Invert this.
Merge pull request #215 from fedora-infra/feature/fedmsg-tail-fixes

Feature/fedmsg tail fixes
Bugfix.  These should not be strings.
Provide rationale for failed validation.