Notebooker

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* Improvement: Prometheus metrics now record number of successes/failures which have been captured by the webapp.
* Improvement: Unpinned nbconvert and added ipython_genutils dependency

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* Improvement: The email "from" address is now fully configurable.
* Bugfix: The default "from" email address domain is no longer non-existent.
* Improvement: --running-timeout parameter allows customization of max allowed notebook runtime

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* Improvement: The index page has been overhauled to be a lot more user-friendly, divided up by notebook template name.

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* Feature: .ipynb files are now natively supported and can be used as Notebook Templates (57)

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* Improvement: index page should be a lot quicker due to storage improvements.
* Bugfix: hide_code and generate_pdf options now work as intended with the scheduler.
* Bugfix: Large notebooks were causing serialisation errors; now safely stored in gridfs.
* **Incompatibility**: Reports run with this version onwards will not be readable by older versions of Notebooker.

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* Major feature: scheduling natively within Notebooker
* See [the docs](https://notebooker.readthedocs.io/en/latest/webapp/webapp.html#scheduling-a-report) for more info.
* Bugfix: Newer versions of uuid now work properly with Notebooker
* Improvement: See the version number in the Notebooker GUI and with a /core/version GET call.