[WIP] added leaflet widget to Chile2010 notebook

This is  not ready to merge. I just created  this PR to make it easy for  @dlgeorge, @ketch, @ahmadia, @mandli, and @rjleveque to test using the leaflet map widget to set refinement zones. The data files that show up as changed below are just additions of those files to this directory--not modifications of the data. The only real changes are to  the notebook.

You'll need the following versions of ipython and leafletwidget in your stack:

ipython:
    sources:
      - url: https://github.com/ellisonbg/ipython.git
        key: git:68f6519cdfd23581ed7358fa1941ae1bbd76e5b3

leafletwidget
    sources:
     - url: https://github.com/erdc-cm/leafletwidget
       key: git:f9147c5b13a69b80bc28d3574f7ba6b2c576aed2