added a requirements file useful for development
added a requirements file useful for development

lucalianas/ome_seadragon,crs4/ome_seadragon,lucalianas/ome_seadragon,crs4/ome_seadragon,crs4/ome_seadragon,crs4/ome_seadragon,lucalianas/ome_seadragon,lucalianas/ome_seadragon