Adopt cabot-alert-slack plugin

[JeanFred]

We have been consolidating the various plugins under the @cabotapp organisation. We have had interest for the Slack plugin.

Steps:

• fork the lblasc/cabot-alert-slack plugin
• get it to work with our newer Django versions
• if possible, move the Github repo under the cabotapp umbrella and update on Pypi.

@frankh is taking the lead on this. @lblasc − does that sound good to you? :)

[lblasc]

Fine with me, I'm willing to transfer ownership of the repo to the @cabotapp org

[JeanFred]

@lblasc Fantastic! The repo now lives at https://github.com/cabotapp/cabot-alert-slack − you should have write access too :)

[frankh]

@lblasc thanks! Could you also transfer the pypi package to "arachnys"? https://pypi.python.org/pypi/cabot-alert-slack/0.6

[lblasc]

@frankh done

[frankh]

Thanks

This is now merged into master

[dankonino]

Hey guys. I wonder if it's still up to date. I did everything up till Add cabot_alert_slack to the installed apps in settings.py
I was not able to receive the alerts, I do with different stuff. I wonder if you can give me a hint ;)