Merge branch 'release/0.9.3' into develop
add support for cowsay command
display the error if the cowsay command returns an error
Merge pull request #273 from sayanchowdhury/cowsay

added support of cowsay command.
Get backlog from datagrepper in ascending order.

It makes sense to process the backlog from oldest to newest.
Merge pull request #275 from fedora-infra/feature/ascending-backlog

Get backlog from datagrepper in ascending order.
Provide more info when crl-check fails.
Careful with "CN".
Still more careful.
Merge pull request #276 from fedora-infra/feature/crl-debugging

Provide more info when crl-check fails.
Implement wait_for argument for fedmsg-trigger

Fixes #219
Improve help message for --wait-for
Remove debugging code
Merge pull request #277 from fedora-infra/feature/wait-for

Implement wait_for argument for fedmsg-trigger
An API for grouping together messages.
Merge pull request #278 from fedora-infra/feature/grouped

An API for grouping together messages.
Fix the link to fedmsg-notify in the docs
A second take on the 'conglomerate' API.

The first approach in #278 didn't provide enough support for what I
ended up needing to implement in fedmsg_meta_fedora_infrastructure.

The gist here is that fedmsg core will provide a ``BaseConglomerator``
class that plugins will extend.  It is an abstract base class, and
children will have to override three different methods for it to work
properly.

I already have a functioning Conglomerator for some bodhi messages that
I'll submit as a PR soon.
Add a convenience method for subclasses.
Be more explicit with warnings from processors.

Should have done this a long time ago.