Replace static image by leaflet map in about page

[pgiraud]

Fixes #661.

Initial javascript code from Andy, simplified and factorized.

GeoJSON has also been simplified (precision lowered using https://github.com/jczaplew/geojson-precision).

Since the map cannot be interactive in the printed report, I chose to hide it completely in the pdf.

Demo:
http://wb-thinkhazard.dev.sig.cloud.camptocamp.net/pierre/

[pgiraud]

@stufraser1 In my opinion, it would be really better if the map was dynamic and would reflect the actual data in the database. It would of course require more work but wouldn't need any manual update of the geojson in the future. Let's consider this as a nice-to-have for version 3. ;-)

[pgiraud]

Question from the kickoff meeting:

How to go about updating this as data layers are added to GeoNode?

We should be able to get this information by requesting the ThinkHazard! database and extracting the up-to-date information.
Programming such a feature will however take some time and it has not been scheduled given the initial terms of reference.

[stufraser1]

With a view to finding a solution to get this done, as it is clearly the most appropriate Aldrich rather than manual update, what is your estimate of time to do this?

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-- Stuart Fraser, PhD Disaster Risk and Catastrophe Analytics Consultant stufraser1@gmail.com Skype: stu_fraser1 +44 (0)7455 048 044 uk.linkedin.com/in/stuartfraserdisasterrisk