Nteract-scrapbook

- Fixed primitives to be json encoded

- Python 3 (3.5+) Only
- Direct pandas support available
- Added fallback for only setting display=True but not encoder=display
- Added some example docs and binder examples
- Fixed encoder vs encoders naming issue

- Adjusted python 2.7 sci-kit requirements

- Added a warning for gluing an object outside of a kernel context
- Added development guide and marked papermill specific functions as deprecated
- Changed error when using GET parameters on cloud storage paths to a warning for non-ipynb extensions
- Changed ipython import to be lazy, saving on initial import times

- Fixed reading string json elements from notebook store (needed to read strings saved with papermill.record)

- Added schema versions to media payloads
- Overhaul of internal modules based on interactive feedback at NES
- Docs are now fully covering capabilities
- Binder links fixed