Modification to the routines for drawing colored elevation maps.#152

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ftomassetti merged 6 commits intoMindwerks:masterfrom

esampson:master

Oct 28, 2015

Commits on Oct 27, 2015

Changed so that None should be passed to sea_level for worlds with no ocean (such as when doing a plates simulation) and changed the blessed image generation to use the updated draw_simple_image_on…
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