Notebooker

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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.

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* Bugfix: `notebooker_execute` entrypoint should now work as intended
* Bugfix: Sanity and template regression tests should now work as intended
* Improvement: Specifying a git repo should be a little simpler

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* Code output can now be hidden from PDF and email output! Either check the box in the "Run Report" dialog or, using the cli, use the new `--hide-code` option.
* Performance improvement for queries

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Support for database plugins and tidying up configuration to be consistent across the board.

**Breaking changes**
* 3 primary entrypoints have been consolidated under one - notebooker-cli, e.g. `notebooker-cli start-webapp` and `notebooker-cli execute-notebook`. Run notebooker-cli --help for more info.
* In config, PY_TEMPLATE_DIR has been renamed to PY_TEMPLATE_BASE_DIR
* In config, GIT_REPO_TEMPLATE_DIR has been renamed to PY_TEMPLATE_SUBDIR