add support for rendering an extra overlay on top of the base map#4

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hholzgra wants to merge 5 commits intomaposmatic:masterfrom hholzgra:upstream_dev_render_overlay

+83-7

Commits on Apr 24, 2016

add support for rendering an extra overlay on top of the base map
hholzgra
committed

Commits on Apr 30, 2016

missing render step for overlay added
hholzgra
committed

Commits on May 6, 2016

Commits on May 9, 2016

don't bail out on unset overlay list in config file
hholzgra
committed