Add main README
Clean the visu folder, move it up to root
Clean up the data/map folder for duplicates
Add simple gitignore
Remove empty notebook for clean up.
Clean up duplicate file.
Ignore IPython notebook checkpoints.
Add a data management notebook
Remove unecessary data file.
Change project structure for data.

Raw data are in `data/from_SOMEWHERE/`.
Data management (notebooks, scripts…) are in `data_mgmt/`.
Move js libs to `lib/`.

Also add queue.js as a local file.
Changes in index.html accordingly.
Move json data to `data/`.