overruled inheritColor if you globally add color information for edges.

lib/network/Network.js

@@ -629,6 +629,7 @@ Network.prototype.setOptions = function (options) {
           if (options.edges.color.highlight !== undefined) {this.constants.edges.color.highlight = options.edges.color.highlight;}
           if (options.edges.color.hover !== undefined)     {this.constants.edges.color.hover = options.edges.color.hover;}
         }
+        this.constants.edges.inheritColor = false;
       }
 
       if (!options.edges.fontColor) {