Nbdime

- Web: Fix output rendering of outputs with a period in MIME type name.
- Config: Add configuration option for front-end extensions.
- Merging: Fix handling of corner case for inline merge strategy.
- Various other fixes and adjustments.

- Added ability for git diff driver to integrate with git filters.
- Improved/fixed merge resolution for similar cell insertions.
- Added config system to allow for configuring the various entrypoints. Especially useful for customizing which keys to ignore when diffing.
- Added control to web view of outputs to select which MIME type to render, and to enable trusting of outputs for full rendering.
- Added jupyterlab extension. Frontend/server extensions are now enabled by default on installation.
- Various fixes and adjustments.

- Fixed layout issue in web diff for cells added/removed/patched in the same location.
- Dropped support for Python 3.3.
- Ensure Ctrl+C will shut down the nbdime web server on Windows.
- Ensure server extension works with 4.x version of notebook server.
- Various fixes and adjustments.

- Fixed issues with the diff filtering options.
- Added git diffdriver using web-diff.
- Added mercurial integration code and entry points.
- Added notebook extensions for integration into its web interface.
- Changed layout for web diff such that chunks of added/removed cells or outputs are shown side-by-side. For small monitors, they will still be shown below each other.
- In the web-diff, relative images in rendered markdown will now show a placeholder image instead of broken images.
- Various fixes and performance improvements.