Milestone Treat Warnings As Errors on Python 2.7

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Treating warnings as errors will allow Twisted users and Twisted devs to keep deprecated stuff out of their code.

This milestone does it on Python 2.7; Python 3.3+ causes many more warnings and many are shared. Once we treat them as errors on Python 2, we can move to do it on Python 3.

Note: See TracRoadmap for help on using the roadmap.