New release and new branch 0.9.x?

[mauritsvanrees]

I can make a release, but fine if someone else does it. I propose the following:

• Merge my two minor pull requests of today (pull #59 and #60). [edit: done myself]
• Temporarily revert the part of my earlier pull request #57 that removes the run_on_failure: it works wonders on Plone coredev, but may be too invasive in a bugfix release. We do keep the new Plone Test Setup and Plone Test Teardown keywords.
• Release this as 0.9.17 and create maintenance branch 0.9.x.
• Revert the temporary revert of run_on_failure on master branch.
• Release 1.0. Use that in coredev 4.3 and higher.

[mauritsvanrees]

I have executed the above plan.

[datakurre]

@mauritsvanrees Thanks a lot for taking care of all this!