Add consistent list sorting (#28)

* fixed implementation of listQueues to return alphabetically sorted list

* Implemented sortOrder for ListQueues

* fixed a test

* convert sort type to flag, cleanup and test fixing

* don't flush (it's dangerous)

* cleanup

Merge pull request #14 from dhrp/feature/retrypolicy

add ability to handle some server downtime without stopping all workers

added deleteQueue

release v0.5.3

fix peek expired

made until-forever work by timeOut

released Fail and ListInfo

Added / Fixed Fail

Upgraded it from go dep to go mod, enabled Hartbeat feature in work