Added a clear queue option, mainly to clear the whole failed queue from the interface.
Bump version to 0.6.1.
Fixed failing test on newer versions of RQ.
Merge pull request #55 from hvdklauw/clear_queue

Added a clear queue option, mainly to clear the whole failed queue from the
Bump version for development.
Updated changelog.
Fetching the details of a non existing job should return 404.
Updated README.