expose fillet attribute for icicle

Author: emilykl

src/traces/icicle/attributes.js

@@ -61,6 +61,8 @@ module.exports = {
 
         line: sunburstAttrs.marker.line,
 
+        fillet: treemapAttrs.marker.fillet,
+
         editType: 'calc'
     },
         colorScaleAttrs('marker', {

src/traces/icicle/defaults.js

@@ -62,6 +62,8 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
     var lineWidth = coerce('marker.line.width');
     if(lineWidth) coerce('marker.line.color', layout.paper_bgcolor);
 
+    coerce('marker.fillet');
+
     coerce('marker.colors');
     var withColorscale = traceOut._hasColorscale = (
         hasColorscale(traceIn, 'marker', 'colors') ||