cleanup IPython handler settings #3088
Merged
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move any settings / shared objects to the tornado settings dict, rather than a mixture of tornado settings and application references, and application.ipython_app references.
Removes any reference to application / ipython_app attributes in the handlers, in favor of the tornado settings dict. These were a massive pain for anyone who might want to re-use our handlers.
This depends on PR #3011, it is actually just one commit (at this point).