Notebooker

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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

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Bugfixes & cleanup
Docker support (14)

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Initial release of Notebooker