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Merge pull request #25 from leplatrem/master

Fixes after merge on geotrek rando
remove global variables in index.js file
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tiled DEM with tiled textures from mapbox (ref #3)
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gaps deleted between tiles (ref #3)
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wip sides
3D sides added (ref #19)
merging
Merge branch 'master' into dem_subdivided
merging
merging done
Drape trek over tiled DEM wip (ref #29)
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side texture bug resolved
wip collisions (ref #24)
babylon 1.11
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