Update geotrellis-server
Update geotrellis-server

 - Fixes multi-scene histograms in analyses
 - Adds `Collection` rel-type

azavea/raster-foundry,azavea/raster-foundry,raster-foundry/raster-foundry,raster-foundry/raster-foundry,raster-foundry/raster-foundry,azavea/raster-foundry,azavea/raster-foundry,azavea/raster-foundry