Add a new WebGLVectorLayer renderer
Add a new WebGLVectorLayer renderer

This relies on a mixed geometry batch and separate batch renderers (lines,
points and polygons). A different shader program is used for each of these
geometries, and three rendering passes are made.

ahocevar/openlayers,bjornharrtell/ol3,stweil/openlayers,bjornharrtell/ol3,bjornharrtell/ol3,ahocevar/openlayers,openlayers/openlayers,ahocevar/openlayers,stweil/openlayers,openlayers/openlayers,stweil/openlayers,openlayers/openlayers