Remove lager and herd deps. Make logging more specific.

[dziaineka]

Hello!

I've updated amqp_client to get rid of lager dependency (new version don't use it).

Also I've removed herd dependency. rand module (in contrast to obsolete random module) makes seed under the hood, no need to call it explicitly.

Also slight logging improvements and removed need to update version in fox.app.src. It will be the same as git tag.

[yzh44yzh]

Thanks a lot!