layer rendering change, overlay class
Merge branch 'refactor/layer-render' of github.com:Vizzuality/gfw into refactor/cblayers

* 'refactor/layer-render' of github.com:Vizzuality/gfw:
  layer rendering change, overlay class
layer render new behaviour, overlay layer class
Merge pull request #658 from Vizzuality/refactor/layer-render

Refactor/layer render
markers
stories