Bump version to 0.12.0

Bump version to 0.11.0

Bump version to 0.10.0

Bump version to 0.9.2.

Bump version to 0.9.1.

Merge branch 'master' of github.com:nvie/rq

Bump version to 0.8.2.

Bump version to 0.8.1.

Updated changelog and tag v0.8.

Merge pull request rq#770 from mtdewulf/queue-cancel-pipeline-fix

Don't run lrem directly if we have a pipeline